How do I make sure I am not his emotional crutch?

We are pretty good friends. He used to like me, then I liked him at a different time. We took some time apart so we could get over those feelings but now we're trying to be friends again. He definitely friend zoned me... but still wants to be close? How do I avoid being his emotional crutch/the back up girl? I feel like I might have been that in the past. Also, can I ever get out of the friend zone with him?
How do I make sure I am not his emotional crutch?
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