I had a one night stand and regretted it?

My ex broke up with me a good few months ago. I’ve been really hurting since. I’ve begged him for months for him to be with me I’ve tried everything I could to make him want me. But nothing I did could make him change.
He’s been using and abusing me. Only contacts me when he’s bored and only sees me to hook up. I’ve watched him party every weekend and see how he’s doing just fine without me.

So last night I had a one night stand. I feel so down about it and even when I had the one night stand all I thought about was him. I told my ex that I slept with another guy he says he’s hurt but I explained to him that he had broken up with me that it meant nothing to me. I just couldn’t take the way he was treating me and I wanted to feel good but I feel so down about it. Should I feel this way or am I mad?
I had a one night stand and regretted it?
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