Co-workers at finest. You and Leon had been the best team for months, ever since 4 years ago. He was the best person you could've ever asked for. Leon was considerate, gentle, serious, hard working and caring. He was even captain sometimes when there weren't any captains available. These little things caused you to have feelings for him. You couldn't resist, he was so perfect in every good way. You wanted him all to yourself and only to you.
Or so you thought.
As seasons changed, you never seemed to take into accountability of Ada Wong. The same girl who had gotten Leon's attention just from a simple glance. It was never you anymore. It was always 'Ada this!' or 'Ada that!'. You could see Leon drift farther away and care less about you than usual, to the point he wouldn't bandage you and you'd have to go somewhere else. Leon was too oblivious to care, and more importantly working a lot, hanging out with friends a lot, etc. It hurt to realize..
He wasn't yours to have.
You were getting out of the truck after a mission, wounded. As you scanned for Leon your eyes fell short on him wounding Ada up --- looking all worried and concerned. You heart broke right there and you went to go look for a medic to get bandaged.