So my boyfriend has a crazy ex girlfriend, she will text him and call him and send him pics all the time then he got a new number and she somehow got his number again and still try's to do that same stuff.  She literally called him 20 times in a row... So I finally texted her and she went off on me telling me that they still have sex and blah blah. Of course I start believing what she says and I ask him about it and he gets mad at me for even talking to her and believing what she said. We've been dating for awhile now. What should I do?