Guy at work keeps talking to me & giving me compliments but he has a girlfriend? What should I do?

I've been at my job for 3 months.

There's a guy that started talking to me on my first day & we instantly clicked.

We have a lot in common, but a few months in, he mentioned his girlfriend.

He always comes and talks to me every morning & we have lunch together most days.

We have a work company do soon, no spouses are allowed but he knows I live far from work & said I could stay over.

I'm not going too.

I don't know if I'm going to much into this but it's weird I have so much in common with a taken man.

He's even said that himself.

Am I going too much into this?

Guy at work keeps talking to me & giving me compliments but he has a girlfriend? What should I do?
Post Opinion