ONCE A CHEAT....
Always a cheat? You know what - I bloody think so. If they're capable of doing it to you once, then they're damn sure capable of doing it again. Even if you do end up with someone who cheats on you, and they stop cheating - the damage has already been done, and no matter how hard you try to convince yourself that they've changed, there will always be that little thing in the back of your mind constantly saying:
The two fundamentals of a relationship (IMO)...trust and communication, no? So if unu can't trust one another then you might as well forget about it. You two have an argument - he/she storms off somewhere...possibly to some substitute? Revenge lay? Consolation?
If you're in a relationship with someone who you know isn't doing you right, whether it's cheating, mistreating, or what have you, ask yourself if you're happy. Relationships are supposed to be enjoyable.
Yes, it's healthy to have the odd argument or bicker here and there (as you do), but you should be able to come together afterwards, resolve any shit you have and be open with one another about every. flipping. thing.
If you ever find yourself in a position where you feel you have the potential to cheat, or you're questioning why you're finding someone else attractive - leave. If your hearts' not in the relationship and your attention is drifting sideways then why waste your time or theirs? If you're having doubts, then it's inevitable that you two will end up drifting at some point in the future (unless you have a complete 100% relapse and find out that the other person you were attracted to is gay and wouldn't like you anyways).
Point blank. If I ever got cheated on. He's gone. I ain't looking to be with a guy I can't trust when there's millions of other guys to choose from. Fin.