Idiom: All bets are off
Meaning: An agreement that was decided on before is no longer valid.
This is usually said when someone breaks your trust or does something to hurt your feelings. For example, you trusted that person before but because they did something bad you don't trust them anymore and you'll do whatever you want and not care how those actions affect them.
Paul and Matt are in Vegas.
Paul: Matt, I told you not to tell my sister that I gambled $500 away! I trusted you.
Matt: I know! I'm sorry.
Paul: I can't believe you did that. I've always kept your secrets, but now all bets are off.