Zoinks! Gf opened the idea of open relationship

So here is some background, I work in US and she lives in Italy. We met in 2017 while I was there and eventually started dating. Then I left for US later that year and since then we see each other for a week or two every 3-4 months in different locations. Today she said something along the lines that she wants to feel wanted again and how being apart most of the year is hard. So she wanted to talk about an open relationship. I kind of get her but not sure how to respond. She said she was at an event and was dancing with a guy and he tried to kiss her. She said no to him but was thinking about feeling wanted. She said she likes me a lot and I feel the same but the long distance makes it hard. She still wants to be with me in the long term. From what she said she just wants to flirt occasionally.. but I doubt it will stay there I did tell her that she is free to do as she pleases and I dont have the power to control her but I am confused. We will discuss over call more later. We really like each other and staying apart for 1.5 years is hard. But I am not sure if opening the box of open relationship will just spring a bunch of new problems and will eventually break what we have and I really dont think it can just start and end with some harmless flirting. Any opinions on open relationships and long distance relationships? Anyone has been in either of our shoes before? Edit: Sorry should have mentioned future plan. She is finishing university right now and she will be done around September. She plans to come here for a month in October and look for jobs here. But she is very European and personally prefers to live in Europe. However I am not a US citizen and if I move to Europe (I am still learning italian and know about 10%) and things dont work out I cant come back here. Its different for her and she understands and she can just pack her bags and leave and US has more diversity + her English is fluent. But it’s hard to get a job here, especially in her field of aerospace engineering so idk what the future holds. I also proposed an alternate that we move to Canada.