Okay so from what I see, you still love him very deeply despite the fact he has cheated on you.
My reasons being that, 1 you wanted to cheat on him to get back, this just shows that you want the relationship to be equal. BUT you did not do that because of course it is wrong. He is the one that made it unequal and he is the one you don't trust now.
You do still love him so my opinion is that you try to work on building the trust again, now this DOES work both ways! Explain to him that you do not trust him anymore for the obvious reasons. Tell him that whenever he looks at another women you get nervous. If he wants this relationship to go on he will respect these feeling you are having and will try everything in his power to build the trust you have once had.
If he cannot accept the fact that you don't trust him you have 2 options.......
1. Tell him it is over and that you never want to see him again.
2. Tell him that you get to have sex with someone you know and are attracted to (as long as they are not involved)
to get even and to start fresh.