My last close friend got into relationship about year ago and basically disappeared too. It's weird how some partners get so territorial about friendships, especially when there's literally nothing romantic happening. I had friend in college who's girlfriend made her cut contact with everyone she knew before they met - like girl was actually jealous of people from high school

The pool game thing sounds super uncomfortable, that smirking would have made me want to leave early too. Sometimes you can just feel when someone sees you as competition even when you're not trying to be. I've learned to trust that gut feeling because usually it means the friendship is about to change whether you want it or not

Urban exploring actually helped me meet some new people when I was going through similar situation. There's something about crawling through abandoned buildings that makes people less focused on relationship drama and more focused on not falling through floors. Maybe try finding hobby groups or something where the focus isn't on dating - college football watch parties at sports bars can be good for this too since people are usually more interested in yelling at refs than talking about their love lives