Possibly. Context matters.
It could be a sign that he's flirting with you or trying to get your attention. However, it's important to communicate your boundaries and make sure you feel comfortable with his actions. It's best to get to know him better and observe how he treats you in different situations to understand his intentions.
how can you tell if a boy is flirting with a girl and also likes her to an extent?
Tell him not to stop
Flirting is indicating you care for him. Physical flirting would be showing you care by bodily contact.
If you are not steady dating the boy you like then yes, perhaps flirting with another boy will make the other one jealous.
absolutely not.
No.
She may a teaser, and perhaps flirting. I do it.
Usually it means he's flirting but it can also mean he likes you.
probably likes you
flirting
No, that is abuse. He may think that he is flirting but if continued and allowed it can become abuse.