Trouble letting go

C – no communication from friend/ex (again) (they reach out, get me involved in their world, then peace out over and over)
T – Wish it were different, want it to better, concerned about them (mental health issues), I care about them, I’m frustrated that it is taking up so much of my thoughts, just want them to let love in. Confused as to what is at core of my thoughts — I am happily married – not seeking a romantic situation here.
F — Sad, circular thoughts, feel like I’ve failed, feel rejected, left confused why it bothers me so much, even though I know some of it has to do with their condition.
A — Try to block it out, let it go but doesn’t work. Will reach out to them occasionally, feel worse.
R — same thing, no change.

Can you help me figure out?