Relationships why do i cheat?

I don't know why I have a problem I try so hard to be good but I have urges to cheat on my boyfriend and can't never stay in a relationship long enough and I always walk out when something so small happens, I am very independent woman but what's wrong with me? After I break up with them I regret it or I am fixated in thinking they are cheating on me and I always start to fight about it why????