Ria,
I'm sorry you are dealing with so much right now.

I agree with what the others have said, and it makes me a little uneasy about how your T is treating the situation with your marriage.
These decisions are never easy, and I don't think they should be made in haste.

I don't see the harm in giving your H an opportunity to redeem himself and get his life back on track, as long as in the meantime he is not hurting you or your family (which it sounds like he is not).
Separations can lead to reunions, which would be the preferred route if he can really change. And if not, then the decision to divorce can be made at that time.

Can you talk to your T about your thoughts about all of this and how you were taken aback by his advice?

Hang in there (((((((((((((((((Ria)))))))))))))))))))))
and keep us posted on how you are.