The guy is not married material or at least he is not ready to get marry. If you sleep at her house 1x, that's cute. Do it often enough and people will think that you guys are married people. Not only that, your kids will cling onto him and will call him uncle daddy.
1 year is not enough. People change hands all the time and the lesser I'm involved, the easier for me to walk away. If your kids cling onto me like leeches, it will make it hard for me to leave. So as a pimp, he is protecting his own interest.
Once again, we are just projecting images and we may be wrong but I still stick to the creep model that you guys are in a sexual relationship. Prove me wrong by asking him if you can bring your kids to the hotel for a sleep over too.
If he's not invested in your family, it explains why the hotel is his safe zone to excludes your kids and all others. He just needs you and your poocee and check out at 11pm.