What do u guys think about a man who claimed to love me lots n promised me to marry me only but he just used me and left me in a condition like hell?

I was innocent or i can say wasn't clever enough. I'm still not mature enough as compared to my age. He used to claim that he loves me a lot and he used to promise that no matter what, he is going to marry me only. And so he wanted to have sex by promising of marrying. I agreed just for his happiness i swear. But after having it, he just made me feel so lonely and useless, not giving time to me and not talking to me like he used to do prior to this. And he just left me without any rsn , without even giving me any reasons, he just left away. I am feeling so used since then. I haven't even recovered from the situation till now. I get into tears the whole night thinking about what was that. Did he just used me and threw. I am not going to fall in love ever again or trust anyone in future. I am badly trapped in such a darkness of self doubts, guilts and doubting my self worth.
What do u guys think about a man who claimed to love me lots n promised me to marry me only but he just used me and left me in a condition like hell?
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