<human>: Can you give me a shortened version of the text?

One of my best male friends and I had a really intense attraction/flirtation but timing-wise, we could never make it work. I was pretty emotionally involved, but about a year ago he found someone else he liked spending time with and moved on pretty quickly. We're still friends and I really do want him to be happy, but some days I hear news about their relationship and its like I'm right back where I was a year or two ago: I can't stop going over everything that happened in my head, wondering if there's anything I could've done differently (even though logically, I know I did everything I could). 

Any advice to help me stop the recurrent "what-ifs"? It's been two years and its getting in the way of my current (6 month) relationship.
<bot>: Tried and failed to date a friend. Now he's moved on but some days I feel like I haven't. How can I fix this?