If he seems interested in you in any way, checks you out or tries to establish contact with you in any way, consider him hooked!
That’s good news!
Here are some exceptions though:
· If he is a colleague at work
· If he is your personal trainer
· If he is your doctor, dentist, therapist
In most of these situations, it is their job to be nice and kind. You can get mixed signals and confuse a kind professional attitude with flirty signs.