He is cheating on his gf with me

I've met a guy online about 1.5 years ago, then short story we had something. We talked every day, exchanging pictures and it looks like an LDR. But honestly, I don't know what it is. He said he fell in love with me, he love me ...

We've met a couple of times and became really "close".

But later I know, that he has a gf and a kid, he told me. He said I am not happy with her, I don't love her...

But he lives with them.

Every day he is always with me, online, because we're living far away. So I know what's he's doing, his job and so on...

The last meet was some weeks ago, we've spent together at his place. It was okay, and crazy because I could see the picture of his gf and his kids.

But, some days later, he kept a distance from me, I tried to ask why. after waiting for some weeks finally he told me that he don'want me. And he just said I don't know what to do .. and I don't love her either.

So I accept his decision because finally it's opened my eyes, why should I have something with someone who is having relationships with someone else? And it's clear that he is cheating on his gf with me, he could do that also on me.

I indeed had a feeling for him, and it was hard for me to let go. But I try...

He told me that what happened between us, should stay a secret. And I said ok. And he was so scared that I could destroy his life. Because he know that I have everything to do that if I would.

But out of nothing, he sent me a very rude text, telling me to go away from his life. Believe me, it was very rude and it's breaks me. I was already gone from his life, I was already moved on... but in the end, he blamed me, instead of realizing what he did to me was destroying me.

I didn't reply to his text.

I forgive him...

I make peace with myself...

But sometimes, comes to my mind to let her gf know what's he's been doing behind her back, for almost 1,5 years. Or maybe more? Maybe there were also another girl before and now after me?

Because I think she doesn't deserve this.

I know, I made a mistake too, with believing his words and letting him get me so good, but I was nobody for him too.

What should I do now?

Telling her gf or just letting it go?

Somehow I feel hurts, because the text he wrote me, it's tearing me apart 💔