George wasn't a romantic, hell, he was far from it. He was a boomerang slinging, backstabbing, lying little piece of sh*t. It doesn't take a genius to work that out.

... Clearly you're not a genius, because you seem to stick around. Don't you know he could up and leave at any moment without regret?

Hypothetically, of course, the thing is.. he doesn't want to leave. You make him feel some sense of normality he can't find elsewhere. He likes that feeling, he likes you.

And what better way to show his appreciation by giving you a totally not stolen piece of jewellery he managed to get his hands on. He hands it to you in Valentine's day in a little box, his rough hands brushing against yours for a moment.

"If ya need any help gettin' it on, jus' let me know." He says dismissively, looking off to the side. See? He doesn't care, definitely not.