falling out of love?

It's especially worse before my period, but i still get this all other weeks. The past few months I've noticed more that i get in waves of not being attracted AT ALL, physically and sexually. Sometimes I'll think my fiance looks cute but then I feel like it quickly goes back to not feeling attracted. I analyze his appearance and face. I check our pictures a lot and sometimes i dont think he looks attractive and other times i think he looks attractive. I compare his personality to others... I keep getting the ick. I feel terrible. I basically have zero libido for sex or masturbating. I'm afraid that he's not the one for me, I feel like I'm getting FOMO. My anxiety gets so high in the morning to where I have break up urges sometimes. At the same time I don't want to lose him and the thought of me not being with him makes me cry.... We're getting married next year and sometimes I feel guilty wearing my ring because im having these thoughts. I feel guilt and question myself every time i think about wedding planning. I question if I love him anymore because of this. I fear I won't find him attractive ever again or in the future. I had a couple days where i had clarity and we talked about our future etc, found him handsome, had intimacy etc, but then like I said it reverts back to the doubting. I keep seeing posts that people who are married 10+ years are still in honeymoon phase, still find eachother massively attractive, have sex all the time. It makes me feel like something is wrong because we're not like that and that I'm supposed to be with someone else in order to feel that. Before we moved in together we had sex 1/2 times a week maybe. Now its like 1/2 a month... And i know part of it is because were familiar with each other/live together etc. But why do i not feel attracted!? My partner is so understanding, sweet and caring even through all of this. Hes so supportive and he's my best friend. I keep asking him for reassurance if he feels loved by me etc and he always says yes. We've been living together for 2 years and been together for 6 total. I keep getting into a depressive state and crying over this over and over and over again. thinking what if we're not supposed to be together, FOMO, if we're compatible, thinking I should just be alone. Its exhausting. And hes always there to hold my hand and comfort me. I got teared up just typing that. Hugging him gives me comfort. I feel like there's a part of me that's suddenly scared to get married, but I want to get married. but it's like suddenly the thought of marriage makes me scared??? But also at the same time i feel like if we were married already i wouldnt be going through this? A few months ago we were looking at houses together, picked out wedding colors, I was traveling for work and was so sad to leave him, and so happy to see him when I got home. I do see a future with him. We talked about kid names in the past. and now I feel like I'm questioning everything in my life for no reason. I HATE feeling this way. I just feel depressed all the time, don't want to do anything, just lay in bed and cry. I hate waking up in the morning. I barely have the motivation at work or just to do my hobbies. I want to be normal again. Anyone been through something similar? Does it get better??? Should I take meds for this?? I'm currently in therapy but I think im going to switch therapists.

maybe i dont want to accept the factvthat i lost feelings, maybe i never actually loved my boyfriend and i hust wanted a relationship , i dont want reasurance, but in very scared i dont love him, because it feels real. im scared

i feel so bad for posting here, idk what i wamt i have so many thoughts abt the feelings i have for my bf im scared my thughts are true or that they will be true and i feel bad for feeling amd thinking this way i such a bad girlfriend, i am scared that i like other people just because i look at them or talk to them normally and i feel like a liar what cam i do to stop feeling like this i am scared