Cheating, lying and breaking the commitment.

When I found out that they’re lying to me. Then, poof! The trust I have for them is gone in a flash.

Telling lies and breaking their promises.

When they did the things they promised that they wouldn't. Not only that they broke their own promises, they also add a new reason for me not to ever put a trust on someone.

Continuously lying.

Their lies and not being sincere when they say they do.

They cheated on me.

Cant keep what's supposed to be a secret between us.

They broke their promises and lied. I'm most offended by people who do those two things, totally turn me off.