I already have a girlfriend, but I have a crush on another girl (who likes me) as well. What do I do?

I love my girlfriend and she loves me more than anything. She values me more than anything in the world and I would never wanna lose her.
But I have a teenage crush on a girl in my neighborhood also. We haven't talked much, so I haven't had the chance to get close to her but I think she likes me too. And my crush on her is growing and massive now.
What should I do?
I already have a girlfriend, but I have a crush on another girl (who likes me) as well. What do I do?
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