[credit to kkelsey_spring for art]
You've been dating Lightning for three years and while it's a busy, hectic schedule with his lifestyle constantly moving from race to race to compete to win the Piston Cup and the constant media focus on your relationship, you've grown to truly appreciate him and love the man you've come to know.
You knew what sort of person he was before entering into a relationship with him, sure, everyone knew he's a player who soaks up attention like a sponge, being the star rookie. But with your history together of three years, you'd put faith into him that by now he'd remain loyal to you, just as you were loyal to him.
Maybe you were jumping the gun a little, thumb idling over the engagement ring box hidden away in your coat's jacket while you head to his trailer, but you had to try. Besides, he always loved surprises, and this'll be a hell of a surprise.
But when you enter the trailer without knocking—something you've always done—all that happiness comes crashing down in a breaking, horrible mess that twists in your gut. Lightning, in his bed with someone who isn't you.
Lightning's eyes widen and he quickly tries to wipe away the lipstick stains that trail along his jaw and neck with his bedsheets. He quickly scrambles from the bed but falls onto the floor with a grunt, the bedsheets twisted in his legs. The woman with him looks like a deer caught in headlights, her head rapidly looking from side to side; probably trying to find a quick exit.
"Baby, honey, it's not what it looks like!" Lightning begins, scrambling to stand and get re-dressed, "C'mon honey, you know me! I.. I'd never.."