I am amazed Jeno at just how self orientated you are. there are 3 of you in this situation , not a word about your child.Do you expect a man to walk away , leave his home , his child just because you have been chatting with someone on FB.
Someone who obviously fancies a bit of a fling.
Get real for goodness sake, you have been together 10 years , have a child ,and are with a man who obviously loves you.
If the spark has gone between you , then make the time to re-ignite what was there, as has been suggested.
If it fails then why do you not walk away leaving him the house and child, so that you can join your potential FB lover.
You cannot have it all your own way jeno.