Sounds like you are in very different places as regards what you both want (or not) at the moment so you have to work out whether you like him enough to persevere and see if things change.
Trying to change him is not the best idea, you can't force him. Well, you can try but it doesn't make for a happy relationship.
As ummmm suggests, there may be parts of his life or things he does which he might not be ready to share with you yet, maybe things he might feel you don't approve of.
Sounds like he likes his freedom too and really, why shouldn't he be able to go and do his own thing from time to time.