Idk what to do

Soo I've been in a relationship for over a year now. I believe that I have fell out of live with my boyfriend. Everything he does irritates me and when he tries foreplay it sort of grosses me out. I feel bad because he treats me so well and I know he loves me so much but I can't do this anymore. Idk how to break up with him because I'm so scared of hurting him. I also have been getting to know other guys (over text) and I know that it's not right. How do I break it off with him? I'm so scared 😖