Boyfriends / friends with benefits

I've never really loved someone I've been out with multiple people but I've never loved any of them! I've always had small crushes on people and ended up going out with them but then only having relationships ( longest relationship) being 3 months, it's like as soon as I know they care I get bored ( really nasty) I know I don't mean to be like that! But I don't know why it always happens!- would it be wrong if I stopped having relationships with people for a while and instead of making a commitment and hurting people if just had someone as my friend with benefits? - I know some people strongly disagree to things like that so don't hold back being honest! - just want people's opinions