Statistically, you're right. You will likely get cheated on and/or divorced. But knowing this fact actually makes you less prone to falling victim to it for a start. You pick out a better patner, you pick up the negative signals better.
You have to accept this fact. You will likely never be loved, so what now? If you really want to love and be loved, do you just give up on that? No. You do whatever you can to love and be loved, for the right person of course. You can't love someone and cheat. You must trust them, because if you don't there are two possibilities, they cheat and oh well you didn't prevent that anyway, or you cheat on an innocent person. You can't expect loyalty and be disloyal. Don't ruin what could be good with rumination, either they Do something or they don't.
If you wish to be disloyal, if its even a possibility in your mind, you don't love someone. Maybe you just don't want love?