List your protagonist's three major flaws. Now list the love interest's flaws. Are they compatible? A neat freak should fall for a messy artist, but not because opposites attract—because the neat freak needs to learn controlled chaos, and the messy artist needs structure. The plot is the vehicle that forces them to trade coping mechanisms.
Look at the romantic storylines we’re obsessing over now: sexart+24+01+28+liz+ocean+know+what+you+want+xx+link
These aren’t “will they/won’t they” stories. They’re “they do, and it’s still hard” stories. List your protagonist's three major flaws
Most writers focus on the physical. But the best romantic storylines build in layers. These aren’t “will they/won’t they” stories
Write all three, and your readers will be invested long before the first kiss.