HELPP İDK WHAT TO DO

So i have a crush on one of my friends old crush!!! Ok so my friend had a same crush as me but she tell me first and i didn’ t know i liked that person at the time so I supported her and stuff. But she got rejected when she confess.She was extremely sad at the time But she got over her and she has a great lover now. But i still feel bad for having feelings for my friends old crush. Sometimes i try to talk about it but she immediatley chance the topic. İdk what to do??