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Question

What can I do about my boyfriend being so close with another girl?

My boyfriend has this close female friend. It always bothered me because of how close they are, so I decided to meet her. That made the situation worse because they were even closer than what I thought. They acted like a couple rather than friends with each other. There was no physical interaction, but he talks to this girl a lot. What can I do? Leaving him isn't an option.