I know every salesman/woman only cares about is getting that sale (most of the time). But what i want to know is how do I know if she really likes me or just giving me compliments so I would buy something.

This weekend I received a notification the gym i wanted to sign up for was having a really discount on memberships. I called and said i was going to come in and sign up, which i did. When i got there the woman helping me was very nice and called me cute on several occasions. I feel like she didn't need to try to persuade me because she already knew I was going to sign up for a membership. Unfortunately she did say she had a boyfriend (who was like 15 years older but I'm not judging) but i kind of feel like I have a chance.

Can anybody give me advice on this? How do i know if she really likes me or just being a good saleswoman?