Insecurity is hitting me hard?

I have a boyfriend who loves me a lot and he is just perfect. I had boyfriends (my past). He had a girl who used to come to his tuition. They fell in love and they were a thing. Then she kind of cheated on him and started dating someone else when she moved to her college. And now he started dating me. My boyfriend and that girl are going to meet on new year because of their tuition reunion. I am very stressed. What should I do?
Insecurity is hitting me hard?
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