RELATIONSHIP ADVICE

I need some advice.
I am 39 and a mother of 4 dating a 26 year old man with no kids. We have been dating for almost 2 years now. I have my tubes tied & would be hell to get it untied and have more children & honestly in my heart I really to just take care of myself for once and not have anymore kids. Ive talked to him about it several times and he tells me that if I dont have a kid with him then he will leave me and have a kid with someone else. I love him and he claims he loves me to but what do i do ? Do i break it off so that i can focus on myself for once or have the baby for him so that we can be together ?