He gives me mixed signals!?

I like this guy at church. He is 11 years old than myself.... and has never been married. I am going through a divorce and have an infant child and he knows that. At church he stares at me from across the church (large congregation) and I can see him doing it. When I up at the front praying he seems to find himself standing only a few feet away from me (comes over from the opposite side of the church). When I say hi to him He says hi, a tiny bit of small talk. But seems shy or scared. He is over 30 years old and I dont understand why he is still acting this way. We saw each other in public and talked for 2 hours joking and kind of flirting... Whats his deal?