Yeah, I know if either of them wanted to ask for marriage of the other, it would be Mulder being more willing to open himself up to the vulnerability of letting her know he wants his partner for a life partner. Always more showing of his emotional feelings. I mentioned in fan art, its hard for me to see either of them wanting to be THAT vulnerable to ask that of the other, even tho other things like sperm donation has been asked for,
I just don't see Scully ever being able to ask Mulder to marry her tho. She took 9 seasons to get to where she would be willing to cry in front of other people and open up, marriage would be an ultimate opening up.
I think the question was just too much for them with the vulnerable risk, that's why they just decided to live together instead.
