Its up to you whether you stick around while he is there visiting the kids. If it is to painful then I suggest making yourself look really good and when he gets there go out and say you will be back before he leaves.

"When I try talking to him it is like talking to a wall. He obviously isn't interested in talking about anything other than what we need to (kids, finances)...not mind-reading here, I actually asked him why he wasn't responding to my conversation."

What are you trying to talk to him about? Relationship talk? Temperature checking? When my W was silent to me I did not speak with her unless she wanted too outside of kids stuff. We lived under the same roof and I got the silent treatment on Thx Giving and Xmas. Also had a laptop thrown at me and a few nights my kids withheld from me. YOU CAN DO THIS.

"He said, "It's just hard with the situation (OW in his life). Does he actually feel like he's betraying her talking to me?"

Mind reading and analyzing once again

"GAL's...well, I have been meeting up w old friends, exercising my brains off, and going to boys' activities. I also scrapbook at home. Need to get out and meet new people, I think."

great, but join something new where you meet all new people that don't know anything about your situation. for me it was a texas holdem poker league. new people every night. no nonsense. played cards with good people and went home.

"Still thinking and researching about getting a cat."
Some inertia here?? What is there to research. Either you want one or don't. If you do goto a local shelter and save an animal. It is actually a great feeling. all of my dogs were rescued.