His wife is leaving again soon and they're technically separated, but I know they obviously still talk.
I moved to a new city a few months ago and have made some good friends.
It is entirely possible that someday he may leave his wife, however, , and you have no guarantees that his marriage will end.
What you can expect when engaged in this type of relationships are a lot of spontaneous changes in your ability to see each other.
First of all, it is unlikely that he will leave a relationship in which he is comfortable in favor of a future in which child support and split assets loom.
If he does, however, consider that he is not reliable marriage material, as he has already shown how seriously he takes his marriage vows.