How do you move on when it doesn't feel like it's over?

Dated an amazing guy for two months. Never thought I could like someone that completely. Same sense of humor, intellectual match, super hot, sexual chemistry, great communication, and an emotional connection.

One night it comes out that he's been having thoughts that he shouldn't let me fall in love with him. Because he feels broken and unable to fall in love after his last girlfriend died suddenly and horribly 1.5 years ago. I know this is bad and I make the call to stop seeing each other.

In the 12-hour (I know...) process of saying goodbye, we told each other how exceptional we found each other, how much we cared about each other, cuddled, kissed, and had sex (I know...) twice (I know!). We also talked about trying again someday in the future, if and when he's in a different stage in life.

That was a little over three weeks ago. And I still think about him too much. I cry too much. I'm worried that I won't really be able to get over him, because I'll always be hoping for us to get back together at some point. And because there wasn't anything that really soured me to him. And because I'm worried that I have a too-ideal person/image/whatever to compare any future prospects to.

So...yeah. Advice, commiseration, tough love?