Yeah, in my situation my S.O. went through stages.
First it was playful curiosity, and I'm sure he thought it was just a vagary of mine for a while and not a serious issue. Then when I didn't drop the subject, he realized it was serious and of course that caused major issue because he's a straight guy. He went through the realization and grief and asked me why I didn't know sooner and all that. Now we're at some stage or other where he's trying his best to help me through it, and vice versa. Far as I know he hasn't done much research on it but what he has asked he's asked me personally rather than going off to look up information by himself. He knows it's a major problem for me but in his own words he himself cannot understand it from his perspective, so he will just do whatever is necessary to help me through transition. He also admitted he has no idea how he will feel further down the line but that he is committed. He doesn't want to know the grisly details of transition and in a way I don't blame him. I don't particularly want to face them, but I will.
I wouldn't say we're typical sort of couple - we've made a sort of pact a long time ago to help each other as if we were family since our own families basically disowned us. There's more commitment there than a regular relationship and even me being trans hasn't managed to wreck it. That said we're not married - if you are I know that's also a major commitment and I hope you can work something out with him.