<human>: I've been working at my job for 5 years.  He's [35m] in a relationship, but he keeps asking me [25f] to hang out, presumably with him and his gf.  What makes things weirder is I asked him out when I first started working at the company, and he turned me down, as he rightfully should have, because it would have been unprofessional.  It was my first professional job and I didn't know not to dip in the company ink.  We have witty, friendly banter at work, but I think it'd be best to keep it at work.

I have a lot going on in my personal and friends life, so don't think I have time for it, plus the situation is a little awkward.  He has a gf, and I've never really bonded with her in the handful of times I've seen her.

Give me the gist of the text in a nutshell
<bot>: My coworker keeps asking me to hang out even though he has a gf and I asked him out previously.  How do I decline politely?