hi kat and welcome to pc!  i'm not sure of what is going on but what i do know is cheating on someone doesn't speak well of the cheater!! since this has happened to you before, perhaps you are choosing the wrong kind of guy. like learning to pick one who is more decent to you and is considerate of others. justme, but i don't feel there is any reasonable cause for cheating except the person-cheater-is very selfish and self centered.
what you may want to consider is why you seem to be choosing this type of guy.
the other thing is are you in therapy? this type of thing can be explored more readily in that setting i believe.but we're always here for you too! 
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Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all. Do not let the hero in your soul perish, in lonely frustration for the life you deserved, but have never been able to reach. Check your road and the nature of your battle.
The world you desired can be won. It exists, it is real, it is possible, it is yours..~Ayn Rand
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