Is it possible to be THE ONE for more than one person?

So I'll start off by saying everyone has a person who is their perfect match. They are perfect for the other person because they help them grow into a better version of themselves. The likliehood that you'll find that person is extremely low. My question is, what if you find out that you are that person to two different people? How do you deal with that? You can't date both, neither girl would be okay with it.

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I know I am THE ONE for my girlfriend and vice versa, but I have a friend who I almost asked out. From conversations, she was expecting this and would have accepted. Anyway I asked out my girlfriend and the friend gave up on me for the time. It's been almost 4 years 7 months since then. The friend has tried dating other people, but none have lasted a year. I can't help but wonder if I was THE ONE for her as well as my girlfriend. Can she never find the perfect guy for her, because it is me?
Is it possible to be THE ONE for more than one person?
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