So my partner and I fought all day yesterday and some harsh things were said out of anger obviously. But ever since then my brain is just going on loops about breaking up with him and I can’t see out of it. Kind of struggling because it feels like I want it

Emotions are a very powerful thing and they grow even stronger when you experience obsessive thoughts. Feelings tend to cloud over your logical thinking and the the obsession of the thought makes you feel like you should take action. When you repeat something over and over your body takes that information as “ this is important and something must be done to relieve it”. I’ve gone through something quite similar. Before you make any decisions…. Think about how you would feel if he was no longer in your life. It seems to me you don’t truly want to break up with him. Know that the power is in your hands. Just because you feel like doing that currently doesn’t mean you have to or will. Obsessive thoughts are tricky but I can tell you when you focus on the negative aspects of things those thoughts turn into feeling and those feeling can turn into regretful actions. Focus on everything he does that makes to happy and I can assure you the feeling and thoughts will fade. Best of luck !