Guy friend says he trusts me. What does this mean?

Anonymous
Basically a continuation to this: https://www.girlsaskguys.com/relationships/q2144752-how-do-i-hide-my-crush-on-my-best-friend-from-him-telling-him-isn-t


During one of my more insecure moments I asked him why he stayed friends with me (post HS) and he told me that I was a nice person to talk to, he appreciated my honestly and "I feel I can trust you" which is heartbreaking and heartwarming all at the same time. Now I feel even more bad about this... he trusts me (and vice versa) yet I can't tell him how I feel because then I'd basically be betraying his trust and keeping quiet is making me feel even more scummy... sigh. Is this even that big of a deal or am I just looking too far into things?
Guy friend says he trusts me. What does this mean?
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