Why is he so open with me?

This guy I’ve been talking to has been very open about his fears and insecurities with me. He’s also been open about his personal struggles. (Which apparently guys don’t do often at all.) I always feel flattered when he does this because I’ve never had a guy be this open with me before, and this is the first time I’ve been open about my insecurities with a guy. So do guys do this with someone because they want a friend? he’s not looking to date, so why is he being so open about his feelings and wants to talk to me a lot for hours?
Why is he so open with me?
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