I was at the gym a few days ago and I approached a girl and she reacted positively. Told her my name and shook her hand while maintaining a solid frame. Just yesterday, I see her again and she doesn't even lock eyes with me or say "hi" when I walked past her. I'll give her the benefit of the doubt because this IS the gym and it's a place to workout. My mind is now on talking to other girls. Should I be more assertive next time and ask them out once I meet them?