Omg. When Melissa was down on her knees begging you to stop, all you had to do is pull her up, hug her and say I'm sorry. That's it! Think of your brother and Melissa as one person. Be happy that joe is happy. Just stop the childish jealousy. Just follow this simple direction if what you feel is true, when or if there are problems between them, joe will come to you for support. Support his marriage now. It will only benefit all of you in the end.