I recently met a girl in a party. We talked for 20 minutes, then she had to go. I told her that I would like to continue the conversation another day, so she gave me her number. Some days after I wrote her and asked if she wanted to go for a coffee. We met, talked for 3 hours, then left. 2 days later I had a gig with my band, so I asked her if she wanted to come watch us. She did come, and told me she liked the show. I think she is interested, but I don't know what to do now. I can get to this point very easily with many girls, but from here on I always tend to fall in the friendzone. Any advice?