We have 2 daughters and that is our lot ! DD2 was very prem and DH is too scared to go thru it all again, we got our miracle and next time we might not be so lucky.
My mother always used to say 'One is nice, 2 is a family and 3 is an army' which always makes me laugh, she had 2 !
I think that it is wrong to think your DH is being selfish as there is no difference to your opinion to his opinion and I would never have another if I thought it wasn't what my DH wanted. He is also concenrned about my health (not the easiest of pregnancies).
I have just accepted the fact but not blamed my DH, he has his reasons and I concentrate on the children I have, not those I cannot have.
I think a lot of women go thru this, especially when their youngest is growing up and their children become independant.
I looked after my nice (aged 1) last week and it made me realise how much freedom I have and how difficult it would be to go back to the baby stage.
For most of us, the loinging passes, I often think ahh wouldn't it be lovely....but then think actually, I have 2 wonderful children and I am grateful for that fact and those children are sufficient, it's just my hormones hehe !
Children need 2 parents who want and love them.