you should tell him why you like him. pretty straitforward stuff
State the facts.
If a boy asks you out and you have a boyfriend, you should say no.
give him a kiss
You say you like him.
It's time to find another boyfriend.
ask a boy you like out. either that or a boy asks you
You can start by learning proper grammar:"What is something sweet to say to your boyfriend when he asks why do you like me?"
Tell him his best qualities and what you like about him most.
Of course! They totaly want to cheat on you
As he is your ex-boyfriend, then it may not be any problem. But ensure that your relationship with him doesn't affect their friendship. This way, it would be easier for all three of you.
it may mean she likes him but my friend asks me, and she has a boyfriend (but then again, she used to like him...)
Yes, it is concerning if your boyfriend asks out your best friend. It may indicate a lack of respect for your relationship and boundaries. It would be important to communicate with both your boyfriend and best friend about how you feel.
As long as you do not have another boyfriend and you still like your first boyfriend at least as a friend then go to the Valentine's Day Dance and have fun. If you already have a boyfriend then you should only go to the dance with your present boyfriend.