I don't know what to do

My boyfriend and I have been TTC for 3 years and 5 months and with no success. I brought up fertility assessments and he said he'd be willing to get checked out with me but I also brought up the fact that if I can't carry a child I want to adopt and if it's his sperm that's causing the infertility then I'd want a sperm donor. That's reasonable right?

Well my boyfriend doesn't agree. He said and I quote "I'm not raising a child who isn't mine" like are you kidding me dude?

Now I'm feeling like I don't know if he's even emotionally mature enough for this. Like if we can't have our own kids with his sperm and my egg he won't be a part of it. This is practically a deal breaker for me because I was born to be a mother I don't care if I give birth or adopt either way I'd be a mother. He doesn't understand what it means to truly want a baby.

Should I leave?