I'm not an expert by any means but this kinda sounds like what I went thru as the guy. Best thing is probably just focus on urself. It's the best solution to all ur issues. It'll bring him closer to ur level whether U still want any relationship or not. But it'll also help you get over the intense feelings. I still think about mine but it doesn't consume me anymore and the neg parts like the anxiety is mostly gone.

Don't take this the wrong way but if him telling u he's happy he still gets to see u at work gives u a negative feeling, u may wanna explore deeper as to why. He probably has his own issues too. At least when i was in his shoes, I was insecure n couldn't figure out if she liked me bc she was giving mixed signals. Good luck!