Wreck-less Coworker Crush?

I work with this guy I've been crushing on for months, I can't seem to shake him from my mind. The trouble is, he's currently seeing someone, they've been seeing each other for six weeks but nothing is official. They have recently been in two fights over this past week and he has asked me my advice on it if I was in her shoes, so I gave him my advice, nothing more though I did want to make my opinion very clear.

Anyway, there's another problem. He just turned 27 and I'm 20. Kind of May December and neither him nor I are exactly for those types of a relationships, it's a very touchy subject. But yeahh, I've already thought things through and if we did go out, I wouldn't tell anyone I work with and we'd just take things slow, just be very mature about it. Drama in the work place is the last thing I'm looking for, mainly since I love my job.

I've thought about talking to him about it until I heard that one of the other girls I work with also had a crush on him and he found out and didn't know how to treat her and just felt awkward, but he wouldn't have been interested in her because she's not as strong of a Christian and missionary dating isn't the smartest idea. So, I'm still spiritually immature myself but I'm working on it, for sure.

I don't know how to tell him or even if I should tell him. I broke up with my boyfriend not too long ago for 100% different reasons though I would be lying if I said this guy didn't help influence the whole thing. But I don't want to tell him and him think I broke up with my boyfriend just for him, because that's just dumb.

So should I tell him? I have a few ideas on how to but idk. I want to wait a bit for my ex to recover but I don't want the guy I'm interested in and the girl he's seeing to work things out. I know that's so selfish but already having two fights?? Btw, they met on eharmony. I don't know if that means anything. But any input would help.