Any advice

Leah • Just trying to figure my shit out

Ok so for around 5 months I have been depressed but I started taking anti-depressants, which has helped me somewhat but I still have horrible anxiety. A huge trigger is this girl that was flirting with my boyfriend everyday for months a while ago but now every time that I see her my anxiety goes through the roof! I think it has to do with that fact that she was very disrespectful behind my back flirting with my boyfriend and it honestly really hurt my feelings :( she has now started spreading rumors to people that know me all these horrible things about me and says I say horrible things to people about her which isn’t true at all I just don’t like her but I’m not that immature to talk bad about her. She is coming to my boyfriends graduation party because she is still sorta friends with my boyfriend and his parents seem to freaking love her and so does his whole family which I don’t know why but bothers me because it’s like they don’t even know how crazy evil this girl is to me! My anxiety is going through the roof right now thinking about having to even be around this girl at my boyfriends house for a whole day. I seriously can not stand this girl she puts me in a bad mood just thinking about her! Can someone please give me some advice to help ease my anxiety I’m desperate