I'm in agreement with Lynn. Timing????? You have a new BF & your ex decides he now wants to be friends (why?)

As far as telling your new BF about this, it's probably NOT a good idea. Not a good way to start off a new relationship by telling them that your ex wants to be friends. Don't think it's really something that's important to your new relationship unless it ends up getting more serious in the first place. Take the whole thing slowly. You don't have to share everything when you are first in a relationship. Only share what is important & if it grows into more of a relationship, then add the more things that are appropriate with the level or seriousness it becomes.

Personally, I don't think it's a good idea to jump into being friends with your ex. Best to have nothing to do with him after all you went through with him. My personal opinion is that it's best not to have any relationships after a divorce for quite awhile until you get back to being who you are & in control of your emotions & become strong & self sufficient. When you can take care of yourself & don't NEED to have anyone in your life, then that is the time when it's ok to allow someone back into your life. (this is a personal belief).