Because he is a guy! You are a girl. It is difficult for you to
understand him.
Let me try to explain what is going on in his head.
I am not him, I might be wrong.
I might be right but he might think I am wrong because he has no
idea what is going on in his own head. hahaha with guys that is
like not surprising. Women are more self aware IMHO.
OK "WHY CANT HE JUST TELL" you?
He can't, he doesn't know. If he is free, he will see you. If he
can get away, he will see you. If he is free and he can get away
and he wants to see you, he will. and that is, if you are free and
available.
He can't tell you to wait and see. He can't say I dunno. He can't
tell you "Hey if you want to have a relationship with a married man
like me, this is what you get, uncertainty."
So what do you want him to say?
To him, the best thing to do is keep quiet. If you want to wait,
you wait, it is up to you... he did not request that of you. If you
do not want to wait and at the very last minute he wants to see you
and you are not free, then you are not free!
Why is he separating? He cannot cope with his wife or maybe he
cannot cope with relationships. If it is because he cannot cope
with relationships, then you have a problem in future.