sue, when my h, left it was not said to be because of me, it was because he had "issues" to deal with. I too thought why can't you stay here and work on your issues?? why do you have to leave? what good will it do us???
turns out my h's issue was the fact that he had fallen in love with his friend. well i'm sure that wasn't his only issue, was also the fact that I didn't believe it to be just a friendship (after all why did he hide it from me) and that we just weren't getting along anyway.
so basically no, it is not about you totaly, he has his own issues to deal with. sounds like you are doing a great job of letting him be. and when you think things are turning in a direction you don't like, just remember it's always darkest before the dawn. LL