Leon was used to being alone. In fact he preferred it. Because that way he wouldn't lose anyone ever again. He had already lost too many people as it was.

But... The changed. He had accidentally ran into you one day, and you two hit it off. It led to him becoming closer to you as a friend, and later... You two began to date. Leon didn't often talk to others and tell them about his lover, as you were a bit younger. While Leon was 39, you were 21. He knew he'd eventually tell them, but he wanted them to find out a bit later so his comrades and your friends could understand that it was love. When Leon began to have bad problems with alcohol addiction, you ended up helping him get out of it. You were always there.