<human>: I am a 25 year old in a somewhat odd relationship with a 39 year old man. 

Long story short, We met while he was in a relationship with his ex-wife. We went our seperate ways but somehow we are back in our relationship once more. We are getting serious and are talking about starting our lives together officially. (moving in, marriage)

Well for the four years we've known each other I have been pretty adamant about wanting children and having a family of our own. I didn't have much of a family growing up so my desire to have a child has always been there even as a teenager. I've suffered from two miscarraiges but the desire to have children has never left me. 

With him, he already has two children age 9 and 11. After his second child he got a vasectomy because he no longer wanted to have children. As our relationship blossomed, he told me that he was willing to have the reversal surgery to make me happy and for a chance for me to have a child of my own. This has been something that he has said for years. 

Last night we talked about our future again, marriage, moving in together, and kids. We seemed to be on the same page but then today out of the blue he told me that he doesn't think he'll be able to have kids with me anymore. He hated the first 6 years of each of his children's lives and he doesn't want to go through that again. 

I am truly heartbroken and don't know what to do. This is something I have wanted for so long and I know would make me so happy in life. 

I understand that our age difference is a huge factor in this and the fact that he already has two children effects the situation as well. Please help me come to a logical realization.

Can you please give me some advice and guidance on this situation?

Summarize the given text in a few sentences.
<bot>: My SO doesn't want children and I desperately want children. What can we do so our relationship doesn't end because of this?