What's wrong with her husband?

Ok, I met this girl online around June of this year. She was looking for friends because she was tired of being home alone while her hubby went to work and school (she's 24, he's 40 been together since she was 18). I was living with my ex at the time, and figured I could always use a women perspective on things. Well, when we finally agreed to meet, it was at a movie she wanted to see and he didn't. After the movie, she wanted to go to dinner. Well, we hung out for a while, mostly in public and found a nice cozy spot at the local lake. This whole time, he knew we were hanging out and even encouraged it by telling her, that if he was going to be home late, that she could stay with me until he was on his way. Eventually, she ended up kissing me, and things just progressed from there. The whole time, until this point, i was a gentleman, I didn't even so much as hug her good bye. Back to the subject at hand. She spoils me, takes me out to eat, to the movies, and actually asks me if I need or want anything when we're in the store, and again her husband encourages this by asking her to make sure I have stuff like my meds, vitamins, mins on my phone, etc...just the usual necessities. Even on thanksgiving, they both came over, and brought me some food, and hung out. WHile here, he asked two VERY interesting questions. 1. Does she call me her boyfriend? After answering no, he said that her and I had a very weird relationship then. 2. Has she told me she took a pregnancy test yet, even though he didn't know why. Again, I answered no, and he said, "Oh, I thought you were the reason she took it."
Yes, they are married, and even went to Rome on their honeymoon and are planning a trip to Dublin for their spring break. IDK, if it's just a cover for him being gay or not. Not saying he is, but he has piks of him on FB cuddling up with life size carebears. NTM, I have a pitbull and when he came over he said, he prefers little fluffy dogs that you can stick in purses. She says he's not, and even if he was his parents would understand, since they accept his lesbian sister. On the other hand, his dad is a rich and famous author and editor, and has been on CNN, and MSNBC numerous times, but yet they live in a small po-dunk town and drive 20yo cars, and live in a crummy apartment complex. She teaches special needs students, went to a university and graduated with a masters in special ed. He's 40, just started a community college to be a mechanic. IDK, something just doesn't seem right between them, and I hope somone can help figure this out. Might I add, she treats me better than any girl I ever dated, and I just don't want to see her get hurt by staying in this marriage.

ETA:Forgot to mention one thing, he's always putting her last. When he goes to school, he stays several hours after to hang with friends. He goes out, most of the time with school or work friends, unless they actually have to go somewhere, they never go out together, he's actually stood her up on date nights that he planned to hang out with his friends. He puts everything before her, including damn tv shows. Hell, they don't even sleep in bed together, ones on the couch, the other is in the bed.