This guy keeps ask me advise on how to get this other girl, and then flirts w/ me. Does he like me?

These guys really falls in love with you People fall in love in mysterious ways even if you guys start as friends. Friends are the most basic but a good start of relationship.

It's not an excuse, he is fishing for advice on you.

Done this myself. Ask friend you're interested in what works for guys trying to get with her, tell her it's to try on someone else, subsequently bank knowledge and use at right moment.

If you're interested in the guy, just answer his questions and pretend you don't know what's up. But start your answers with "Well, if it were for me..."