I honestly wouldn't do it, dating or going on a date with a friend's ex is a terrible thing to do, it's like a subconscious sort of friend-code where we don't date or do anything with a friend's ex.
It is never okay to date your friend's ex-boyfriend.
No you should still date him its not your friends choice who you date it's yours!
Yes
He asks you because he is jealous of you and your boyfriend going on a date. Maybe he wants to ask you out.
find another girlfriend
a girlfriend/boyfriend is someone you're not related to and someone you like more than a friend. yes, you might go to a movie with your family or friends, but it's not quite the same as going with a girlfriend/boyfriend
Dating your best friends boyfriend is shallow. Date some other guy until she dumps him, then you can date your friend ex with out any big problems, though its not that good of an idea because jelousy will most likely follow. so just don't!
Don't go there! He is going out with your best friend. But then maybe you to belong together as you both are lying to her.
Dates don't have to be you and him/her alone and going to the movies or lunch or things like that. If you two have gone out together with friends in an outing or if you two have just been casual friends for long enough, you don't need to have a date to establish a relationship. If you both like each other and would like to be boyfriend and girlfriend, then that is what you are. A date just allows you two to get to know each other better, so its good when you guys are boyfriend and girlfriend. A date is not a confirming tool, its just another setting to be with the person you like.
Use good pick up lines
There is nothing you can do to prevent it. Your boyfriend is about to be tested & you will soon find out who your friends are.
It depends... you say he is your boyfriend, so it really depends on what the situation was. If you were with a group of friends, then it was just hanging out with friends. If it was with more couples, it could be considered a double date. If it was just you two, then, yeah, I'd consider it a date. If his friends were behind him, laughing, then it was probably a dare. But, yet again, you call him your boyfriend, so it probably was an actual date.