Can’t tell you why they’re ignoring you, but it sounds like they’re not being very good friends to you. I’ve had similar problems with friends in the past - I gave up on them because it hurt less not having friends than being treated this way. I get it if you don’t want to do that, though.
Asking them directly what’s going on and explaining how it makes you feel might be a better approach here; you’d at least see where you stand, even if they couldn’t be totally honest with you.
I’m sorry you’re experiencing this, too.