I tend to agree w/Lou. What you do w/your personal life at the moment is your business. There's no need to advise your h since he's not living under the same roof and hasn't for some time. Trust me, he's not telling you everything he is doing.

Now, if you meet someone and you really like them and want to continue on w/the relationship, then I would mention it to your h. There's no need to even let your son know until you've met someone that you truly care about as well.

For now, keep your personal business to yourself. If it gets out to him, then tell him.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.