"he went rock-climbing with some guys from his IOP group, and I was a bit bummed that he was gone for most of the day and that he didn’t invite me "
This is awesome!! He is making new friends/bonding with guys that don't drink. Think about
how much drinking plays a part in activities guys do when they get together....it is a real
problem guys have to deal with in sobriety. Sorry but I think you should be really grateful
for him doing this, I think it's a really great thing, nothing to be bummed about at all!
Are you involved in alanon? I'm sorry but I can't recall your support system? The time alone
thing is best and it needs to be mutual. You two were together 24/7 for some time and frankly
thats not sustainable or healthy. This is good growth, and hopefully you will expand your
friendships and activities with others, it is important for success.