How to not get attached?

Hello, so in the past I have got my heart broken so many times simply because I get attached to people so quickly, and they do not. I guess I just have a lot of expectations and expect them to feel exactly as I do, but they never really have.

Anyway, I've started talking to a new guy online, and I really want to avoid getting hurt again and so I want to stop myself from getting attached before I know that his feelings are the same as mine. Any advice? Thanks :)
How to not get attached?
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