Some of us ask God to show us a "sign" about a guy that we KNOW shouldn't be with in the first place.
God shows you his heart and his rebellion towards him. and its still not enough. He cheats on you and its still not enough.  He lies to you, its still not good enough.
He sleeps with you outside of marriage...and its still not good enough.

At some point you have to stop searching for a sign and check the rotten fruit on the tree. The signs are clear. he isn't for you. Stop trying to pick up what God clearly told you to put down...