JMO but no way would I even consider having another child with this man.He hasn,t been there for his first child so why do you think he would be there for no. 2. I can't believe he suggested it or you would even consider it at this stage-yes sex might be great but kids are a lifetime commitment. Life as a single mum is hard enuf with one child 2 is much much harder. Words are cheap, look again after a few years. You both owe the child you have now that much.
