Cheating/revenge

Ok so my bf of 3 years cheated on me recently and I found out then we split now we're back together because he was so sorry and begged for a second chance. And I love him. But I'm starting to just not be interested in him. And I even want to cheat on him back just to prove how bad he hurt me. This is so wrong I know. But has anyone else ever felt like this? I'm obviously very confused. Help? Advice?