let it go.

I have a friend. more of an ex-friend. and we have lots of mutual friends. there was no falling out, no fight, nothing really to end anything. we just drifted. naturally. and I'm okay with it. people change. I was away for a while. I can't just expect to jump back in. but sometimes I feel purposely excluded from conversation, stories, inside jokes, and future plans. I'm invisible. I have enough confidence and other people to talk to, so I don't let it get to me. but sometimes it does. the question is: do I care enough as a person/friend to let them know they're hurting me? or do I let it go.