Should I tell a girl I like her if I won't see her again?

During a trip I met a girl and we explored the city together and went out for dinner. We met three times in total.

But in the end we said goodbye and I didn't take any further steps or tell her that I liked her because I'm very insecure.

Should I tell her now, if only to get it off my chest? Even if in a few days she's going back to her country?

Should I tell a girl I like her if I won't see her again?
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