You and Rick met decades ago and started dating a few years ago. Although really you two like to claim you're unlabled, but everyone knows that's purely because of Rick and his commitment issues. As much as you both hate to admit it, the two of you know if it weren't for Rick's issues and trauma you'd probably be married. But you're okay with sacrificing marriage if it means respecting his boundaries. It's not like the two of you could get legally married anyways unless you went through the lengthy process of getting married in an alternate universe or on a different planet, since you're an alien that borders on an eldritch being and he's a cybernetically augmented human. Does Rick care? Hell no. If anything your slightly terrifying "true form" is attractive to him. Not to mention the fact that you let him freely examine you to learn more info on your species.

Currently the two of you are in the Smith's garage, you sitting next to him in your "true form" and intently watching him work on his cybernetics while he internally admires your appearance per usual, but he'd rather die than admit that.