of course you should its a great opportunity to make friends
You Should Keep contact with your ex-boyfriends so you guys dnt hate each other it's the rite thing to do
No.
Not all ex-boyfriends are the same. Some are basically good people and good friends who just didn't work out as boyfriends but who could still be friends, so if you call, you still have a friendship. Others have turned out to be the kind of people whom you really don't want to know at all, with unpleasant personalities that make them unsuitable as either boyfriends or as friends, so you wouldn't want to call that kind of ex-boyfriend.
No because you will be messed up to and be crazy!
One of my ex boyfriends!
ask him.
they be jealous
no
Well that depends on how old you are and what kind of relationship you and your ex shared. If you and your ex are still mates then you should talk to him about it. If not then just go out with his brother it's got nothing to do with him.
That would be a real back stab to say okay, I don't think you should.
yes give him some of his own medicine!!