Guys, what is your responsibility to a woman your dating when you leave the country for three weeks?

Okay so I'm leaving the country soon for three weeks going to four countries including Santorini Greece and I have been seeing this woman since January we are not in a relationship however we are very romantic with each other She is the sweetest person ever and I didn't tell. ger that I will meet up with some other lady friends (Germany and Greece) while I'm away I mean why mention it but also how should I act towards her while I am away and what about my social media posts?

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I mean I will not post pictures of other women but is that being dishonest? Do I get her a souvenir?
Guys, what is your responsibility to a woman your dating when you leave the country for three weeks?
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