You must now "transform" into "Private Eye" woman.
I'm sorry that your husband does not make wild passionate love to you. I know how sad that is. What I'm concerned about here is that reading your question it seems rather obvious that something is very wrong here....very wrong indeed.
Buy a little tape recorder at Target or somewhere like that, hide it under his car seat. Switch out the little cassetttes every two days. Listen in on any phone calls and/or converstations he has in his car.
Go on-line and purchase the "spy" software to "spy" on his computer activity.
Go on-line and purchase the "spy" equipment to spy on his cell phone, it only takes two minutes to install it onto his phone and he will never know.
Follow him.
Stalk him.
Get the proof that your Divorce Attorney tells you to and then....get everything.
e-mail me this other man's name and phone number and I'll go on-line to the web-site "Complete Investigative Services" and we'll try and get an address on him. That is, If you'd like my help.
Go on-line and purchase the "tracking device" that you hide on his car, then you go on-line and have a complete record of everywhere he drives his sorry axx.
You mention that he sleeps downstairs, hide a tape recorder in his room, in case he is making phone calls......this could be very informative.
You say he has a tennis bag? Okay, time to find out who,what, when and where he is playing tennis. This sounds very important.
If you have any close family member or friend try and get them to help you out with this crisis. You are in a very trajic marriage, wether or not he is gay...you say that he is abusive, your on the rocks. That's hard.
You can do this, you are going to make it, no matter what bad, evil choices your husband has made.
So far you need the following;
1) A lot of courage.
2) Spy equipment.
3) more Spy equipment.
4) someone to Spy with you.
5) even more courage.
You can do this! You are not alone in your sufferings, many wifes are or were in your situation. There is much hope, all will be well.
P.S. DO NOT ASK HIM ABOUT THE ICE MAN, HE WILL NOT TELL YOU THE TRUTH, YOU MUST DISCOVER IT.