There are different takes on this. Personally if you are married, up until the very end, you don't date. You are trying to save your marriage and that means staying in it.
I believe you stay on the path you are now. I believe he is curious as to why you are different. Stay focused, you and son and keep on with your life. He chose not to be there, why show your hand. He has work to do to get back into this marriage but don't expect him to run back in. Good for you, not rushing in when he showed you some positive attention.
Hang in there. kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory