Im losing feelings?

I think I'm losing feelings for my boyfriend and I don't know what to do about it cause I don't want to.Hes an amazing person and treats me like gold but it just hasn't been the same recently.We have been dating now for 3 months and its been great but there's just something off like when I get with him I just dont know what to say so I get quiet and then we start arguing cause I'm not usually quiet and he knows that but I can talk with my friends and it just feels different like i dont know how to act around him anymore.I also am on anti depressents and I havent really been taking them correctly recently so i dont know if that has anything to do with it.I don't know what to do but I dont wanna lose this one.Please help, any advice or just your opinion would be appreciated.