I think it's definitely something to do with getting revenge on you. He seems he wants to hurt you and get rid of this Butch. I don't think you should, just to please him. He needs to sort himself out.
If, however, he is actually, truly wanting that relationship with Barbie, then it is up to him. If you are unhappy that he has someone else, get over it or end it. But living as a hypocrite is never a happy life.
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