Yes if you dont want to be friends anymore then do it unless he is ok with it then u can still be friends and then every thing is going to be just fine
They can be if you don't get jealous. If someone has offended you by dating your ex, you are free to end your friendship with that person. However, you might also prefer to continue your friendship....
That's between you and your friend.
Answer.
If this is a really good friend and you value that friendship, I would tread lightly. Good friends are hard to find. Still, things I would consider are:
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