HELP A SISTER OUT¡¡¡¡

hi everyone.I have dated my boyfriend for almost 4years now.at first he used to date someone I knew and we slept together while he was still seeing her..the thing is I knew about it and I just wanted to sleep with him but after I did it I felt so guilty..after that I never saw him or talked to him..months later we moved to the same city and the girlfriend went to a different city.after a while they broke up and he came and asked me to be his girl...I didn't accept at first but since I liked him I accepted finally...n we have been together for almost 4years now...so now he is away but coming back in three weeks times but I can't help but think that he might have done something wrong....at first our texts were lovey dovey but now its just plain n everytime I notice a change it makes me jumpy and think alot...the thing is I wanna stop loving him so much...I have a happy independent life,I give him space,allow him to hang out with his friends,we don't fight alot.....

I just wanna stop loving him so much..cz I'm scared he will do the same thing that he did to his ex...n I don't have the strength for that seeing that all my strength is directed to loving him..I just wanna love him but not too much