Doesn't want to talk about it

My husband and I have been ttc for over a year now. I've known since I was 13 (I'm now 28) that this might be hard for me because I have endometriosis. Although my ultra sounds showed that it didn't seem to be too serious, we still have been unable to conceive. Recently my Dr. Put me on a list to have surgery to check things out and in the meantime recommended my husband have a sperm analysis done just in case. Well his sperm analysis came back low motility. Nothing too severe, the normal range is 50 and he's at 40. He goes for a second analysis in a week to rule out any errors. When we found out about his potential infertility I felt like a weight had been lifted off my shoulders. We finally had an answer and it wasn't just me it was both of us. Although we always say it's "us together" and not someone's fault specifically, it was getting to be a bit if pressure on me. Anyway, I started doing research and found out that luckily chances are good with iui so this morning I was talking to my husband about it and he got pretty worked up, asking why I was already being negative about the next test results and that he doesn't want to talk about any of that stuff right now. I told him that I was happy we have an answer for us and that I'm a planner and would rather not waste an appointment with our Dr so knowing what we want and how we want to proceed is being proactive not negative (appointment times in Ontario with Dr's are hard to get so going in prepared is always best). He's being so different after these results now yet when we knew it was just "my fault" he was supportive and fine to talk about options. I don't understand what the difference is. With it being both of us... I felt better, we're no worse off. If anything this helps to fast track our appointments or surgeries. But he's taking it so personal and I'm trying to be supportive but I don't know how.

Sorry just needed to type it out. Feeling alone in this right now.