Want another baby and husband doesnt

My husband and I have been married 10 years and have two beautiful little girls that are 6 and 2.5. My husband was an only child until his sister was born when he was 8. I grew up in a larger family and am 1 of 5 kids. We are all close in age as well, my mom had all of us within 7.5 years. Before we got married I told my husband having children and a large family was super important to me. I wanted to have 3-4 kids. I have been at the point of wanting a third child for over a year now. We have talked about it several different times and neither of us is budging with what we want. I want a third and he is done. We are both starting counseling/therapy this month, but we are feeling like a divorce may be what’s next. He suggested it so I could find someone else who still wants kids. It seems silly to throw away our marriage and the family we have built for our two little girls, but my heart aches for another baby. I work in pediatrics so around babies and children daily. Has anyone else ever been in this situation?? How did it go?? I am torn with what to do…