I have a favourite person who isn’t my S/O and I feel like it’s really putting a damper on our fairly new relationship, and I’m not really sure what to do. 

If my FP calls when I’m talking to my S/O, I hang up the phone. If my FP is rude to my S/O I don’t defend them. It’s really affecting our relationship and I don’t want it to but I really can’t control it. I feel so bad for my S/O for having to deal with this shit.