How do I deal with jealousy toward my twin brother and his girlfriend?

We Met This Girl on on college and i kinda had crush on her but it nothing like serious but we starting to hang out as trio often and i even had make up few times with her but day by day she gets more close with him and eventually they become couple. My Brother and I living together and she be in our house often and they be like "whats problem with me" when i show some jealousy. When I show some love on her he became more possesive. He wasn't like that before. What should i do?

How do I deal with jealousy toward my twin brother and his girlfriend?
Post Opinion