I just pretend to care about my friend's problems.
Why do you just pretend to care about your friend?
I feel like I'm supposed to listen, but I don't really care, so I pretend.
That is sad. It's not cool to only pretend that you care about problems that your friend is having.
A friend is supposed to do that. When they don't need me anymore, they'll leave.
If you think friends only pretend to care about each other, you've not found the right friends in your life. You should make an effort to meet people who you truly want to support and who truly want to support you.