What happens if I don't conceive?

My boyfriend, 28, and I, 29, have been together for over seven years. We lived together for four years, and six months ago, we took the plunge and secured a loan to buy a house and lot. Throughout our relationship, I've frequently asked him when we would get married. His usual response has been that he wants to have a baby first. He has promised me that he will stay with me even if we don't end up having children. We've been trying to conceive for some time now, but it hasn’t happened yet. Last month, the doctor informed me that I have early signs of infertility, and I’m really scared about what that means. What if I end up being infertile? I worry that he might leave me. And what will happen to our house and everything we've built together? Three days ago, we had a fight, and I texted him suggesting we break up since I had blocked him on my social media accounts. I expressed that I was tired of the relationship and of him, but so far, he hasn’t reacted. We’re still sharing the same room but not communicating. I feel lost and overwhelmed. I’ve been diagnosed with emotional depression since 2018; it has its ups and downs but always seems to come back. I’ve struggled with thoughts of self-harm many times. Right now, I’m battling with my emotions, praying, and crying constantly. Please help me. I don’t know what to do in this situation. I love him, but I feel like I’ve reached my limit.