Why do I feel like a cheater after rejecting someone's advances?

I always wonder “what if I’m not attracted to my partner” “what if I still have feelings for other people” “what if I cheated on my partner” “what if my partner cheats on me” “what If my partner annoys me and I don’t actually want to be with him” and I’ll do this so much over and over that I get so worked up I’ll criticize him, over analyze him, feel as though I don’t like him. But then an hour later after I find relief ( from telling him, looking things up, talking to my sisters about it) I’ll be in love with him but I won’t fully feel it because I’ll just be thinking about how I just felt before and how bad it was or anticipate it again for the future. So I’m constantly ruining it for myself, and it hurts so bad because he’s so perfect for me and so kind to me and everything about our relationship is right but my mind tries to convince me of other things and it feels so real.

Hi- I’ve come here because I feel so overwhelmed with my emotions and how to deal with them. I have a male colleague who I have been working with and consider a friend. We would text casually as friends but I stopped because I didn’t want him or my husband to get the wrong impression. My colleague knew I was married, but continued to text me casually. I made sure to always mention my husband. At that time I didn’t think it was a big deal so I would respond to be nice (and since we were co workers) but had no intention behind it. I wasn’t sure if he had a crush on me because he didn’t tell me but I sort of had a feeling he did? Anyway our company went on a work incentive trip and I met him in person for the first time. I even introduced my husband and they got along. I thought everything was good until I started to notice I wanted his attention and wanted him to notice me? I think I wanted to get it out of him out of him if he liked me or not. He continued to text me while on the trip and one night told me I looked pretty (i said thank you) then proceeded to text me if I would have a drink at the bar with him. I did not respond to his texts or show my husband as I didn’t want to cause a scene during the rest of the trip. None of that happened either. I thought to not make things weird I would text him the next day as if nothing happened. Anyway, I felt so guilty after coming home from the trip that I shared every single detail with my husband and have convinced myself that I cheated. My husband is the most amazing man I’ve ever met and it kills me that I can’t be in the moment with him and I’ve become obsessed with compulsions and checking to see if I’ve cheated. Even if my husband said I didn’t and he forgives me and to move on, I can’t stop replaying every single interaction and how I felt then and what I’ve texted or of I came across as if I was flirting. I confess to him every night to help me feel better but it only works for a little. I really want to move past this but it’s become so overwhelming that when we’re with other couple friends I have a thought to compare if our marriage is as good as theirs or if they have experienced similar struggles and it kills me that this issue has caused me so much stress to even ruminate the fact if I love my husband or if this means there is a stain on our marriage and I can’t move in from it. I was at such a happy place in my life and thought nothing would ever come between me and my husband but I just want move past this guilt or thoughts of me cheating. Please share some advice if you can thank you

My boyfriend and I have been together for almost a year coming this May. I have never had feelings for someone like this and I genuinely see myself living the rest of my life with him. Talking to him comes effortlessly. He sees me for all that I am and works with me. My family has already begun developing a connection with him as well as I have with his family. I’ve never felt so at home until meeting him. Lately my ROCD symptoms have been playing on the narrative of him either finding a new girl that interests him and is somehow “better” than me OR me ruining our relationship because of potential cheating I have absolutely no actual interest in cheating because I know he’s my person and so am his. I know I’m going to marry him and I know that I want him to be the father of my kids. I want to see him grow and I want to build a foundation of unconditional love with him. So why do I shame myself? There’s this shop that him and I go to quite frequently, and the last time we went an employer that we typically see every-time we come began talking to me personally. We were all just talking about movies but my boyfriend mentioned that he felt like he was flirting with me. I begun feeling bad like I was doing something wrong. My mind started telling me that I liked having him “flirt” with me and that it made me feel desirable and confident in knowing that I was still considered attractive. I’m scared because now everytime we go the employee seems to be staring at me and when I went today he actually gave me something for free which led to me thinking I was playing into the flirting narrative and that this would lead to something worse (Though I still have no interest in doing so, just anxiety about that happening is the best way to put it) Has anyone else experienced something similar? Is there any advice that can be given? I don’t think anything’s going to happen, but what If I do like knowing someone likes me even if it’s not reciprocated? Does that make me a cheater? Or is that the product of unresolved self worth issues?