Search Results: girlfriend flirting with other guys

There's this guy I know from work. We never met outside of work but we haven't known each other that long.
He always spends breaks with me. He randomly stands next to me/my desk, while talking to other colleagues and he tells me about his secrets, aspirations, fears, his family, his childhood... And we often talk about our families. He even flat out asked me, if I'm taken, even though he should've known. It felt like him trying to be absolutely sure.
He makes sexual jokes but rarely.
He stands very close to me, usually a lot closer than with other people.
Other people have started teasing him about liking me. He usually blushes and doesn't really say anything. He just tries to change subjects.
Sometimes however he points out things like not wanting an older girlfriend (I'm 6 years older) or that he never had a real long term relationship. That's confusing to me.
Does he have a crush? Does he want to be friends?