I really don't get where everyone takes the "creepy" bit from. I always found him thoroughly likeable.
About the "coming on to her", he actually tells her expressly afterwards that he had had a vision that showed her as part of his future. He must have hoped she'd be shown the same thing when he led her to view the Orb.
I reckon he was starting to fall in love with her by then so couldn't manage to be completely neutral and detached, but tried not to make an obvious pass at her until she'd worked out what she wanted. I always read his behaviour as just that, trying to give space to someone you're attracted to, and didn't see anything creepy about it.