LOYALTY is not something that you ask for from your partner. It is a feeling, an emotion that should come from inside. You can't just ask people to be loyal to you. It's isn't worth a relation if you keep on nagging for loyalty. Just remember that the more you let them fly the less they will feel caged and also feel the love from your side and won't want to hurt someone who understands their needs, i.e. YOU.
LOVE is not caging someone, not trying to force them to be with you, not trying to control them but to let them free and love them unconditionally with all their flaws.
If you can't do that, you aren't in LOVE, it's just that you wanna conquer their soul and body.