How long ago was it that you saw him? He probably thinks “hooking up” doesn’t warrant any type of disclosures. Yeah ideally when talking about hookups, he could at least say he’s seeing other women. Well you are right that ideally thoughtful thing would be to say something or stop texting, but he’s not that thoughtful.

It didn’t work out with him before so I’d not expect anything different now. He caused you pain before and now it’s happening again. It’s better to not rekindle it with exes. You can enjoy life without these bozos