would you be pissed?

i’m in high school and my boyfriend went to homecoming with this girl earlier in the year before we dated. they never had a relationship or anything, but she likes him. she is snap chatting him all the time and it’s always something like “why don’t you like me” or “do you still have a girlfriend” or asking about me. it never really bothered me since he is my boyfriend and he obviously doesn’t like her and she’s just making a fool of herself. but today she really pissed me off. I just learned today that she works with my boyfriend. I was shocked when he told me and he thought I already knew. he told me how she would stand really close to him to touch him and he would move away from her. he came over after work and sent her a pic of me and she got mad at him. like was upset at him for being with his girlfriend. he went home later and when she saw that he wasn’t with me anymore, she commented on how she was glad he was home. he was telling me this and I got so pissed. being petty, I liked the picture she posted from homecoming months ago. I’m just annoyed with her and I think she needs to back off since she doesn’t have a chance with him and he has a girlfriend. I just needed to rant honestly.