So he's always talking to his ex...?

and it REALLY pisses me off. She lives in mexico and they're always on msn and webcam and stuff. He says they are like besties even after being in a relationship, but I really don't like it. She tells him personal things, like vibrators she plans on buying and stuff. And he always likes telling me about funny things that happened while they were going out, especially ually. I hate that they're probably closer than we are, even though we were biffles before we started going out, and I hate that I feel intimidated by a girl I haven't even met. I feel jealous that he's had with her and not me, and that kind of makes me feel pressured to go further (I'm fifteen, he's sixteen) but I don't want him to stop talking to her because they're friends. Should I tell him how I feel or should I just deal with it and quit my bitching?