I would ask him straight out. Leave your ex properly, be open about his feelings/relationship with you. You don't have time to sit around waiting for him. If he can't commit to you now then you need to let it go. Move on.

Grieve the relationship that it could have been (and really who know it could off all gone pear shape after a few months anyway. How do you know you would have been suited as a couple KWIM?)

concentrate on you & your 2 yr old & just take life as it comes.

Is it possible more could come from the friend who made the offer? maybe he is your Knight in shinning armour.....