<human>: Summarize the given text in a few sentences.

Hi /r/relationships. Without saying, this is my favourite subreddit. I'm not gonna use a throw away because I already feel ashamed of myself and I don't care if he sees it anyway. 

I'm gonna call (17M) J.

To cut a long and draining story short, I found out over the weekend that J had been lying to me and using me for sex in the last few months of our year and a half relationship. He had created a web of lies, about his parents fake divorce, about where he was living and most people he knew or spent time with. He also lied about loving me and his feelings, which wouldn't have hurt so much if he had been honest in the first place. 

Apart from being disgusted with myself for falling for his crap twice and being used, I don't really know how to feel or go from here. I'm going no contact so far, and I ended things with him yesterday over the phone (since he didn't have the balls to see me face to face).

I feel very shitty but I also feel like I need some kind of reality check about this situation. I have an amazing support group of people around me, I just figured the extra support wouldn't hurt. I know I'm only 17 and it's kinda stupid and I'll look back on this, I just feel like it's crazy that someone can lie for months and I didn't even know it. I'm sorry for the wall of text here, I would love some advice or even a short sharp shock from anyone.
<bot>: jerk of an ex uses me for sex and lies for months when he has no reason to. Feeling ashamed and stupid and not sure where to go from here