hi anon! i'll be honest, this is a strange place to contact me, but if you want anonymity then that's fine. i'd say that this is a thing that happens, especially in cases of attachment-based disorders like bpd. being extremely attached to another person may make you feel apathy towards people you aren't attached to. you could purposefully ignore others or miss special events because of your attachment to someone else. in extreme cases, some people will completely cut off contact with anyone else. you may also feel jealous of other people who speak to the person you're attached to. i can't give you much more than this without any specific details, but if you'd like to chat more and in a timely manner, you can dm me on discord! (skaianmagicant)