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Given the contents of this text chain, it's too late for OP, but I'm a semi-oldfag here (29) with many years of experience with many dozens of women. I can hopefully spell a few things out for other younger college-aged anons.
OP fucked up by making it personal. If we boil it down: he wants her to stay because he's worried about her safety, and he's worried about her cheating on him. tl;dr - he is worried about losing her. In his attempt to persuade her, he is using rhetoric and tactics that appeal to HIM, rather than to her... what he's begging her not to cheat on him, because he LOVES her and VALUES her, etc., but really thinly veiled with an "oh you might be in danger and there's plenty of stuff for you to do here" argument.
This is destined to fail.
Why? Because he is literally telling her that he LOVES and VALUES her so much that he is terrified of losing her... ie there's a solid chance he will take her back after all but the most serious of transgressions. Abandoning your bf/gf to go on a "volunteer-cation" in an exotic touristy spot is a shitty thing to do. It almost guarantees that sex and romance will occur (unless the person in question is so disgusting as to be totally undesirable... in which case what are you doing with them?)... but unless that transgression is provable (protip: it isn't unless you hire a PI to follow her there), this guy is saying outright that he will take her back even if she goes.
(cont...)