I'll be honest. Relying on one person and one person only, is never a good thing in my opinion. Not only is it unfair on them (especially if they know you only have one person because they may then feel obligated to help even if they are not in a good place mentally, or busy, or whatever), it also narrows down your support network so much that you probably won't get help when you want it most.
I'm not saying you shouldn't talk about things, because it's good that you are. It's just that you need to be aware that your friend has their own problems and may not always be available to support you or talk to you. In the same way you may not always be available for them.
We all deal with problems differently, and what may seem trivial to someone could be impacting on their lives in a major way. Similarly there are people who experience horrific traumas but carry on in much the same way as before. We are all different, and just because something doesn't seem as bad, doesn't mean the person's difficulties are lessened.
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