I have been married for 9 years to a wonderful man.One day I was on a chat line talking to another guy and then started talking to this guy on the phone.I told my husband that I was going to leave him for this other guy.:confused: 6 months my husband sleeped with my sister.So I thought that I would get back at him for that. Me and my husband are still together but he doesn't trust me at all.He is always checking my phone and what I am doing where I am at all times.since that has happened.I don't get it at all.::( Any more I am lost.Please tell me what I can do.

Sounds like what caused the expression two wrongs don't make a right to come about.
Guys seem to have a double standard and even when they cheat on you with your sister before you cheat back they have a way of turning it back at you being the one that has to live with the consequences of mistrust.
My neighbor's husband cheated on her with her sister for years. She even ended up pregnant. Then when she found out she figured she might as well cheat on him and he never let her live it down.
You either live with his cheating if he still is and prove to him you quit he is now the guilty party. Or you say enough is enough and leave him.

What!! He slept with your sister for 6 months? And your still with him, I say leave and leave now!

Oh dear. Your on a chat line, leave your husband of 9 years -- "just like that!" -- then he sleeps with your sister and you feel the need to sink down to his level and get back at him. Now your back together and your wondering where this mistrust is coming from?

Am I missing something here?