I've decided that I'm going to cheat on my boyfriend.
Is there are reason? Why are you planning on cheating on him? DId he do something?
I wanted to leave my boyfriend, but he won't let me. So I think that I should cheat on him, it is the only way to stop him from continuing to ruin my life.
If your partner is making you feel so unhappy with the relationship that you have to cheat, then you should just leave him. He might make it hard at first, but stick with it because you should never cheat on your partner or lie to them. Just tell him the truth and hope that this is enough to make him leave you alone.
I've tried but he makes it so difficult I feel like the only thing I can do is cheat.
A lot could go wrong from cheating on your boyfriend, especially if he is as controlling as he sounds.  It may sound easier to cheat but there could be unintended consequences, and as wrong as your boyfriend is acting, you should take the high road and leave him, and get help if you feel threatened by his behavior.