His ex girlfriend is ruining our relationship.. What should I do?

Anonymous
I have been dating my boyfriend for a while. Our relationship has been great.. except his ex girlfriend always calls him and texts him and tells him that she misses him. They were only dating for 5 months and she cheated on him so she always wants to talk to him and be his "friend".. I never really had a problem with it. I had sex with my boyfriend for the first time today, so I was going to go on his Face book and write something sweet as his status, (we do this often with each other) but when I logged into his face book.. messages started popping up from his ex girlfriend.. not trying to read it, I went to click out of it until I saw with my own eyes that they BOTH said that they missed each other and they said they need to start talking more and he told her to text him.. What really upsets me the most is that I tell him everything, when one of my ex boyfriends text me.. Just the fact that he told her that he misses her and that he wants to try and work harder on their relationship really just puts it over the edge. I checked out the time of this and I found out that while they were talking back and forth.. He was on the phone with me.. And did not say one thing to me.. I don't know what I should do.. Would this be called emotional cheating? Should I break up with him? Help?
His ex girlfriend is ruining our relationship.. What should I do?
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