Im looking for a romance manga about 2 childhood friends. The boy is in love with the girl, but she doesnt know, because she is in love with another childhood friend who gave her a handkerchief when she was little. Does it sound familiar? 😀

Hmmmm, can't really help you with finding it specifically, but I can help narrow it down for you somewhat.

You can 'advanced search' for a series on this site, so if you use that and type in tags such as 'Childhood Friend/s' and 'Love Triangle/s' plus selecting other specifics you know such as genres, whether it is a manga/manhwa or even if it is completed, then voila, you will have a short list of all the possibilities...

Hope that helps

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