Am I being selfish?

So my boyfriend and me have been together for 6 months and he's been raising my 1 year old as his own due to her biological father not wanting her..So I was helping my best friend set up the nursery for her new baby and now my boyfriend is talking about he wants a biological child of his own and I don't :-( I already have 2 children and our relationship has been awkward since I mentioned getting my tubes tied am I being selfish since he doesn't have children himself?