There’s no easy answer to this question, as the sweetness of a guy’s actions can vary drastically depending on the person. However, some things that may be considered “sweet” by one person might not be seen as such by another. That said, some things that are generally thought of as being sweet include doing something kind, taking care of you when you’re not feeling well, making you laugh, and being romantic.
If you’re looking for a specific example of what might be considered sweet by a guy, I would recommend turning to the comments section below! I’m sure somebody out there has had a similar experience to the one you describe and can share a firsthand account that is sure to make your heart melt! 🙂