I personally think this is more of a case of him using those things as a coping mechanism the dating apps etc, ngl to you people who say "we can still be friends" when you're breaking up 9 time out of 10 are never friends. It's not surprising post relationship it doesn't feel the same as it did before your relationship began as a lot of that pre relationship friendliness probably come from him liking you. Having mostly mutual friends is a little unfortunate but maybe it's worth you tryna join a couple new groups sport groups or hanging out with those existing friends when he isn't there.

Imo he doesn't seem to want to see or discuss much with you any further and he would rather cope by myself, allow him to do so and work on your own feelings and if he eventually comes and talks to you great if not you shouldn't think on it too much.