What do you do?

Depends on the guy!

Some do the following:
- Get loud
- Become very quiet
- Go out of there way to help
- Consistently act as a friend
- Show no attention
- Always act like a big brother

It depends on the guy but they can show many signs.

If he's into you then he's going to try to make you laugh as often as possible.

Being available is the first thing I guess. Using our charm, with and trying to be noticed. That could be different for shy ones though. Once we know we have the attention, then we show the feelings. Buying flowers, doing things with her, going out of our ways to make her happy, like skipping the ball game to go to a celine dion concert.

First don't come out with some cheesy lines that is the worst. If you come out with cheesy lines it makes you out to be a player even if you're not. Make eye contact see if they are interested and assume all is well (smile), make conversation, always ask a women questions women love a man who is interested in them and want to know things about them.