What is the sweetest and romantic thing you have seen a couple doing?

Quite a few things which I have done, experienced (Like to experience) or have seen couples doing.

1. Boy handing over his wallet or card to his girl in any shopping out let and never bothering to know about the bill.
2. While eating out , girl using her scarf or dupatta or handkerchief to wipe out food pieces out of the face of guy.
3. Girl offering her own bottle to drink which she tasted from mouth and after boy finishes drinking from it, girl drinking it again via mouth. No my bottle, your bottle.
4. Boys protecting their girl by creating a shield of arms around her, specially in crowded place like Mumbai Local. The sense of possessiveness and ownership (In right sense) is touching.
5. Girl looking their boy departing and not stopping looking at him till he vanishes from the scene.
6. Girl or boy feeding their partner whole food they have only because they liked it and remaining hungry in the process! (I just had food and I am not the hungry analogy).
7. Sacrificing their favorites to buy things for the other half as presents.

Source: What is the sweetest and romantic thing you have seen a couple doing? – Quora