How should I feel?

So my boyfriend has this friend who he used to sleep with/was in love with and she’s recently gone away for work. They still talk everyday on the phone and I don't know what to do about it. I don't know if it’s right that it makes me feel weird every time he talks about her. Ik how he feels about me but also knowing how he feels about her makes it a bit harder to deal with and harder to be her friend.
What do I do?
Fine to feel like that
Your wrong
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How should I feel?
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