Guy with a girlfriend flirts a lot?

I work with this guy who has been dating this girl for about four months now. He says that he’s happy with her, but I know they fight a lot and he’s not exactly in a good place in life right now. Not that she’s caused that, but she isn’t exactly helping. We now work together and he flirts with me a lot. So much so that other people we work with have noticed and say stuff to us about it.

Despite my best efforts and against my good conscious, I’ve developed a little crush on him. He’s just so cute and has such a fun personality that I can’t help but feel attracted and maybe even a little hopeful. What exactly should I do in this situation and is there any hope for me?
Guy with a girlfriend flirts a lot?
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