I have a thing for my trainer and need some advice…?

I’m not really sure what to do. I’ve been going to this guy for a while…probably about 6/7/8 months and he’s always been super friendly and nice. Makes me laugh. Though not my usual type. I don't know if I’ve just been single too long or what but I don’t want to fall in that trap where someone is just nice but it’s being taken as flirting. I’ve been on both sides of that and it’s never fun. The problem is that some of the stuff he says feels that way. I know I can’t do anything since. Ya know. I’m paying him to train me and all. And I’ve been through 3 trainers (for the record: guys and girls for longer than this guy and never felt this way for them.) in 5 years so I really don’t want to switch again and our sessions are the highlight of my week. I have no issue with flirting a little. But I’d almost call him a friend at this point and now I’m worried that a little flirting is turning into feelings on my end. I don’t want to put him in a bad spot and I don’t want to be embarrassed if he finds out but I don’t know how long I can keep it a secret since I’ve always been a very expressive person. What should I do?
I have a thing for my trainer and need some advice…?
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