Possible in blacklist?

Hi,
I was living in Thailand for on and off four years until a domestic abuse from my ex Thai bf last year. However he managed to turn the matter around by showing the police photos of his wounds I inflicted on him out of self-defense. After that he even without my consent, forcefully threw me in a mental hospital for two weeks. I’m not entirely sure about the Thai laws regarding this. But in order to resolve things quicker, or so I was told by the police, I signed a paper admitting that I assaulted him, paid a tiny fine and was let go.
My question is, would I be considered in blacklist when I try applying for a Thai visa right now? It’s been more than 5 months since I signed the paper, and more than half a year since the “assault”. And no, I don’t have the “stamp” some mentioned on this site on my passport. Does that mean I’m not in blacklist? But my native country’s embassy in Thailand seems to be bought by my ex, as they told me I would have trouble re-entering Thailand due to my record. Or are they bluffing?
Please help. Thank You in advance.