INNNERZONE,
Believe it or not, this is more common than you think, especially with Bipolar people. The problem with the internet thing is that is it all fantasy. Something your husband is compared with, for instance his inability to talk to you, but this guy can, but yet because it is fantasy, he can never live up to it. Let me see if I can explain it, as it has happened in my life, only I was on the other side.

In the internet relationship, even if it moved on to phone calls and meeting for coffee and nothing more...the fantasy of what this man MAY become is prince charming. In other words, its what he WON'T become. He won't choose to watch a football game when you need to talk, he won't get drunk and embarrass you in front of family, you won't have to wake up to his nasty smells and bad breath and all the annoying habits. He won't go off on you over some pet peeve of his that has no basis in reality, and , here's the big one, He'll never be a bad lover because you won't sleep with him. A real person can't compete with the fantasy.

Proceed with caution and share with your therapist. We are most vulnerable when we are in the beginning of bipolar cycle. Please take care of yourself, and give yourself value. I hope this helps and doesn't sound preachy, it was not my intent.
Tunesinger