<human>: Give me a shortened version of the text

My coworker showed interest in me a few months ago and eventually asked me out. We went on a couple dates, but I noticed by the end of the second he seemed less enthusiastic than he had even at the beginning. We made plans to hang out again, but he flaked several times; I was annoyed enough to tell him to just forget it and moved on. 

At work he held back for a little while, then returned to his usual self, though being more flirtatious and giving me compliments. Eventually we did meet up again and slept together. It was fun and we both seemed to enjoy it. I was definitely looking forward to pursuing something casual with him, so I initiated an invite to hang out again and he begged off. I was annoyed, again, but I shrugged it off. That was about a month and a half ago. More recently I was thinking maybe I hadn't been bold enough so I asked him to hang out and he again completely flaked. I decided this was the last straw, seriously this time. But here's where I'm confused, now he's being flirtatious with me again, like often going out of his way and acting all cute.

Honestly, all I really want is to just meet up and have sex again; I want to say he seems interested, yet when it comes to actually making plans, he's barely reachable. I would get over it if not for the way he acts at work. It seems deceptive. Should I maybe confront him about it, or should I just try to let it go? I'm a bit bugged also because this other person who just got hired seems rather into him and I feel a silly little twinge of jealousy at the idea that he might hook up with her too.
<bot>: I'm interested in coworker, he seems interested too, yet he keeps holding back. Why might that be and what should I do about it?