As always we can only understand and control ourselves. We can’t really have an answer on why other people do what they do. Focus on your actions

Be more selective who you are friends and partners with. If they repeatedly ignore you, move on and stop pursuing them. With family is a bit different. I don’t suggest you cut ties as there is more to it.

But with boyfriends and so called friends, if they ignore and ghost you, move on and don’t waste your time. Don’t continue messaging. Guessing why they ignore you is a waste of time