Very good, that is important to recognize. Yes, you made yourself "available" and that's what you have to pay attention to.

I am a nice person and you too are probably a nice person but you don't have to be available to another person who suddenly treats you badly. Especially when that person doubles down and uses something you shared against you. That's not something "nice" people choose to do.

People often show you who they are, BELIEVE THEM and walk away. Don't make yourself available so you can be treated badly.

This individual displayed important red flags, if you keep making yourself availiabe then it's your own fault when you are again treated badly. Choices always have consequences especially when ignoring important red flags.