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He may be emotionally fragile after the divorce,and his wife andher lawyer may be checking for other women his life, as you know..that happens in these situations.
But you should't let I pass without protest when he doesn't even respond to questions about posible weekend plans. There's no excuse for that kind of thing, regardless of his circumstances.
If there are reaons he's not available or can't answer your questions, he needs to open up to you . it sounds like you know each other well enough, that he should be able to do that to some extent!0