Why does he flirt with me, then ignore me, then flirt with me again?

So here’s the scenario:
I’ve known this guy for a few months now, we work together and I see him pretty much everyday. Problem is, he has a girlfriend. Yes, I know, I don’t need everyone telling me to back off and respect their relationship. That’s what I’ve pretty much been doing, but I still wanna understand why this guy does what he does - so for a few days, he’ll flirt with me a little, play around with me or we just sit and talk about whatever. The next few days or week, he’ll almost completely ignore me (we make eye contact every so often and he won’t even say hi). Then he’ll go on to talk to me a lot, then back to ignoring me. (Last I heard, he was over his girlfriend and I know they fight a lot so I don't know if it’s gonna last... but for those of you concerned, yes, I’m trying my best to respect their relationship)
Why does he flirt with me, then ignore me, then flirt with me again?
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