My Boyfriend is best friends with his Ex Crush. What do I do?

Anonymous
My boyfriend recently told me that he and his ex-crush are newly found best friends. She knows that he liked her and she JUST broke up with HER boyfriend. She asked me if it was okay that they were together and I nudged it off in annoyance and jealousy. I asked my boyfriend and he told me about it and the jealousy rose as self-worth lowered. On top of that, they jokingly call each other Honey as I have seen their texts. I am indeed somewhat stressed as she told me a few weeks ago that if she didn't fall for her boyfriend first (now ex) then she would have fallen for him (while he liked her). He liked me for 2 years and in the middle of the second he lost hope, so began to like her for the span of a few months, before relapsing back to me. Now they are so-called "best friends" but still not THAT close. WHAT SHOULD I DO?
My Boyfriend is best friends with his Ex Crush. What do I do?
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