I'm glad he agreed, and you will be going to the RE! Now that the decision's been made, I'm sure it's a weight off of your shoulders, and you will be looking forward to getting some more answers. As Elyesia said, it's definitely another step in the right direction!
I'm not up on my SA information, so I can't help you there, except to say things can change. My SO and his ex-wife split because they couldn't get pg. They both had problems, but together it was like slim to none that they'd have a baby, and that was all she wanted. Anyway, he had multiple sperm issues but the biggest problem for him was motility, but he's still managed to do the job a few times for me.

Together, he and I have multiple fertility issues too, but here we are again. So chin up, w/ the assistance of the RE, you will definitely get there too! I hope you'll be seeing your bfp soon!