I think every girl I've ever been with has either cheated on me or was cheating on someone with me.
I'm sorry to hear that. Why do you think you've been with so many cheaters?
I don't know, I've never cheated on anyone.
Dating can be difficult for any number of reasons and the faithfulness of a partner is a big part of that difficulty. If everyone you have dated has cheated on you or cheated with you, you should try to be more selective in who you date. Cheaters do not make good partners and are likely to leave you emotionally damaged.
I just want to be treated better.
I think you deserve to be treated better, so you should start by making sure the person you're dating is really worth your time. If you know they've cheated in the past, or are currently cheating, then you shouldn't get involved with them. You should look for honest people.