How not to get attached, not have feelings?

I am in love with my flatmate,
And she seeks care and understanding but only a brother (she is Chinese and I am Indian)
How I can get rid of the feelings
So for the past 2-3 weeks I have been hanging out with her, and everyday I felt like she likes me but she made it clear that she doesn't. I wanna get rid of the feelings but still be caring cause we cook, eat, talk to each other on a daily basis.

She likes one of my friends and I tried to arrange a date but I had to be the 3rd wheel.
She was too sad after sometime cause her cat died (back in china). She did share with her crush but she cried for like an hour. With me.
Can someone suggest something that I can do over here so that I can start being a brother.
How not to get attached, not have feelings?
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