(And no, I am not addressing only those of us who write in one of the romance sub-genres)
Inspiration for our stories is everywhere. Today, in particular, (it's Valentine's Day, just in case you didn't know) I challenge all of you to use this special day to let some of that inspiration in and take hold.
And remember, love of a romantic nature is not all there is. It could be about love for a child, a parent, a sibling, a friend... Or perhaps the care, compassion or love for an animal or nature. Heck, your character's care and compassion for mankind in general for that matter.
So, discover where your character's passions reside, and inspiration will surely follow.