Guys, How to communicate effectively to this old flame that I genuinely care about him but won't stand mistreatment?

I am in on and off relationship with this one old flame. It is just that we met in difficult time and I regard him as someone dear and special to me cuz he was there for me and I was there for him. He recently contacted me again and I was just happy, so much happy and this is like meeting again that long lost old friend feeling and it was not about me tryna making him stay and choose me, pick me, love me vibe. Just I was happy and feeling good in general. But now, he acting like upper hand and tryna play some stupid games and started treating me a bit shitty, I got anxious yesterday despite knowing all his tricks. I also feel regret that I showed him I still care about him a lot. How do I resolve this issue?

Guys, How to communicate effectively to this old flame that I genuinely care about him but won't stand mistreatment?
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