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This guy is overly possessive, jealous and controlling. Its only been 3 weeks and he is already trying to stop you from seeing friends. What do you think he will be like in 3 months? Unless you are...

She did all this to you because you let her. Set some healthy boundaries, if someone crosses them tell them and if they keep on crossing them break the relationship/friendship off for good.

Two options:

1) Give the girlfriend an ultimatum either to tell her fiancé about the cheating or you will tell him yourself.

2) You can keep quiet.

If you choose 2 then the affair will...