How do you write romance without making it sound sappy?

Chrissy Grace asked:

I’m working on a novel with a little bit of romance in it. The romance isn’t the central plot; the main focus is on an adventure/fantasy story. When I work in the little bits of romance, how do I avoid making it sound unrealistic? I want it to be believable because my hero and heroine aren’t exactly the sappy type. How do I write romance scenes without it being the cheesy “you are my life now” kind of thing?
Thanks in advance for the answers!

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