Overthinking always an issue

So my bf and I had a little fight over his girl best bc he was going to hand with her and help her shop. I was totally against this bc they once slept together and it also doesn't help that when we first started dating she had feelings for him. This escalated to 3-4 days of crying from both him and I. We got past it now and set boundary rules. The thing is since the fight I've been feelings numb and I guess detaching myself from him because I've always done this. When ever the relationship has one thing that hurts me or the guy does something I don't like I usually say fuck it and dump him. With him it's different I'm actually staying a compromising because I love him and I want to stay with him. He's my future but my mind won't leave me alone my biggest fear is losing him losing feelings and I can't help. Basically my mind is saying hey take a break and my heart is saying girl you love him if you didn't wouldn't be feeling this way. Please help. Advice to put my mind on my mute and my heart on full blast.