When you still have feelings for someone it is impossible to hold a platonic friendship with them.
You are still idealizing the relationship and hoping for a relationship reunion. It would not be fair to either of you to contemplate a platonic friendship.
Tell him 'no' and continue trying to work over your feelings.
I feel that part of the problem is sometimes in single motherhood you don't have the time available to offer a close friendship with many and it's often difficult to make many friends at all. So while he is being social and probably has a great number of friends, you are not as socially enriched so you cling and idolize thoughts of your relationship together.
Continue working on you and growing yourself. Three years younger is a great difference for a man with a younger women in most instances especially a young single mother with a younger man. You have a full plate and it would be great to offer your child the family relationship that you desire, but take you time, branch out and make the best choice you can for yourself and a relationship.
Good luck to you.
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