<human>: Condense the text into a few key points

Hey all. I found out last week my ex (we broke up in June) has come out as gay. We got together when I was 15 and he was 16 in high school, and we had a pretty good relationship. We lived together from the age of 17. We talked about getting married and having kids.

We split up due to long distance (I moved away for college this year) and he stopped talking to me, despite saying he wanted us to remain friends as we'd been through so much together. I was confused and unsure as to what I had done - the breakup was mutual, so I wasn't sure why he was angry with me, if he was.

I found out through one of our mutual friends he had told his family he is gay, and was currently seeing a guy.

I don't know why but I burst into tears. I feel like I've wasted all my teenage years (15-20) with this guy who, ultimately, never would have been attracted to me. We never would have lasted. I just feel so awful and... kind of used. I've tried messaging him but he isn't replying to any of my messages now. I'm not sure what is going on but I'm not even sure how to feel. My friends have told me not to take it personally but I can't help but feel that way. :(
<bot>: Guy I dated for almost all my childhood has come out as gay and I feel like I've wasted so much of my youth on someone. How can I get over it?