The gym is not the best place to meet girls because people come there to train, not to meet.
The best way find a love is to go to a dating website.
At the gym just improve your body and health.
If it so happened that you liked the girl too much - go for it! It's better than regretting a missed opportunity.
You should not try to impress a girl with your biceps, because the most important thing is sincerity, a well-groomed look and how you talk to her.