BIL got the Slay the Spire board game the other day. We played Act 1, hoping to beat Act 2 at some point this weekend. Pretty enjoyable playing the game in a cooperative fashion.
If you're on Android, BuzzKill can set your notifications to "cool down", so if you get multiple within a short time, you will only get buzzed again once a set amount of time has passed.
I can absolutely relate to what you're describing. Sometimes you need a break from a specific person, and it is not because you dislike them, you just really need a break. This is, from what I can tell, not a common neurotypical experience and so not something that neurotypical folks can relate to, and it's hard to put it into words as a way that sounds anything other than "I don't like being around you".
The closest I can come to putting it into words is that sometimes my mind behaves like a cat. One moment you're both enjoying each other's company, the next I'm totally full and need to go. It's not about any specific person, it can happen with anybody I'm around.
It's good that you're working to understand how to express your experience to others, it's difficult but worth the time to strengthen relationships. Hopefully your partner understands that it's not the easiest thing.
You left their party after a couple hours to relax. I'm guessing you were feeling a little overstimulated and needing a break, and your partner probably realized this as well and was willing to let you decompress.
Then you accepted an invitation to socialize with someone else, which to your partner probably seemed like you needed a break from them but not someone else. Of course, this is not a one-to-one situation, I'm sure swimming and a sunset is much more restful and relaxing than a birthday party, but from their perspective they probably wished you could have stayed but respected you needed a break. Now they're finding out that you didn't necessarily take a break from socializing, so it looks somewhat more like you needed a break from them.
Again, I know that isn't exactly what happened, and it isn't the message you meant to give with your actions, but that's my attempt to see things from their perspective based on what we've been told.
Shower mirror. It has a base that suctions to the wall and a reservoir that you fill with hot water so that it doesn't fog. I had no idea how much better it was than shaving at the sink. If I'm in a hurry I'll sink shave but I love shower shaving and I love that mirror.
Edit: Here's the one I use. No major complaints, just remove the mirror between uses and re-suction every once in a while.