Is it rare to find a partner that actually tells you you're the only one they want to be with?

And for them to actually stay loyal to you and treat you just the way you always wanted your partner to treat you. Also to top that off also stay in a relationship with you that lasts for years and still love everything about the relationship you have with them?
Is it rare to find a partner that actually tells you you're the only one they want to be with?
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