Tw: Pregnancy and sexual health

I(F22)can't help but feel like Ive done something wrong. My whole life all I've ever wanted to do was be a mother and have a loving family. Well I've been with my boyfriend(m20) now for 2 Years, him and I grew up together and waiting until we eere for sure we wanted ti be together. We've always loved each other and have always had a good sex life. We knew we want to have children together and since being stable enough to start trying last year my hopes just keep going down. I've been checked for fertility issues and I'm fine, and my boyfriend thinks it's his fertility but is to afraid to get checked. I understand, he says if it does come out he can't produce children he doesn't know what he would do, he feels like if he factually 110% kmows he can't give us a child then he doesn't know what kind of man he is. I can see how hard that is and im very sympathetic towards the situation but at this point it's been over a year of constant unprotected sex and nothing. My hopes seem to just getting crushed more and more each time the test shows a negative. I love him and will stay with him through thick and thin, even if infertile. I won't see him less of a man or anything like that. I just hate the not knowing and the hoping that gets crushed each time I test negative. Sorry for the rant but I needed to vent. Any advice or kind words would be much appreciated right now.