Guy's Behavior

Does my gym instructor like me?

There's an instructor at the gym I go to that I like, but I can't work out if he likes me too, or if he's just being friendly.

We get on well and have a laugh together, and recently he's been asking me to come to extra training sessions, sometimes when the gym is closed in an evening. These are essentially when he does his own training and follows his own program. His friend is always there for training as well, but as far as I can tell he doesn't ask any of the other girls to come and join them and only a few of the guys who have been going for years. He says it's because the sessions they do will really help with my goals and because he thinks I'll enjoy them, which is true, but some of the other girls have similar goals and have never been asked to join him at any of these sessions.

If there are exercises in class that we need to team up for he always seems to make it so we end up working together, and seems to be jealous when I get paired with another guy. He's told my friend that he loves working out with me and admires my determination and work ethic. He also gives me random compliments and looks for excuses to come and talk to me after class - he hangs around the exit so he can talk to me as I'm going past. I feel like there's a lot of chemistry between us and I think I'm starting to fall for him.

The thing is that I know he has a girlfriend so I can't work out if he's being friendly because he's looking for extra business in personal training sessions, whether he just sees me as a friend and genuinely just likes working out with me or he does actually like me. What do you think?
Does my gym instructor like me?
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