That sounds better, but one camping trip a year? Is that enough for you?
What was his excuse for not letting you know what was going on?
I think you should be looking for one date night a week. Otherwise he could just swap you out for his mum. I'd be looking for equal time with the lads. Most of the partnered up folks I know - it's like 3 date nights with partner to 1 night out with the boys, ie 3hours with you to 1 hour with mates. If any of my friends get partners - I hadly get to see them any more but we're still friends.
Definitely keep in mind the "get gone" weekend for you just to help him sort his priorities. You may also want to get him to tell you in advance when he's doing stuff with his mates so you can plan to do stuff too so you're too busy to feel sorry for yourself because he's not there.