How to make a girl like you again after going cold?

So me and this girl were like really close, and sometimes hooked up. But recently she started acting distant and cold. Looks like she is seeing a guy, but we were never a thing.

After a few weeks of no text responses, or real interactions, I kinda noticed that I’m in love with her.

I want her back in my life, what should I do? She is the type to get jealous real quick and angry in seconds. Help me out, I really want her back and would love to date her.
How to make a girl like you again after going cold?
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