Why? Why give her the benefit of the doubt? She clearly says she can't promise she won't sleep with other guys in case she makes a so called "strong connection" with them.
What the hell does she mean by strong connection anyway? Does it mean she falls in lust when she sees some hot dude with a charming smile, nice accent, and good body, then decides she can't pass this up and fucks him? Or she falls in love with another man even though she's in a relationship with someone she claims to love and knows that he loves her in return? I call BS.
Doesn't want to feel restricted. Doesn't want to have to worry about breaking any rules. She's young and she's never had a "one night stand." Holy Fuck. Are you reading the same thing I'm reading because I don't believe you are.
It sounds like they've already talked and she knows his boundaries already and that he's uncomfortable with the idea of her sleeping with someone that's not him while their dating. And it seems like she doesn't care.
This is the thing. When we're in a relationship we put our time in it, our love, our laughter, our affection, our effort, and everything in between. We grow together, we create memories, support each other, and people forget that because they only see that they have 80%. So they go out in the world to seek that so called 20% that they think they don't have, whatever they believe their SO can't give them in their relationship. So they find that 20% (that new man or woman) and throw away years of love they created with their SO because they now think they finally have the full package, the complete 100% that their SO couldn't give them. But in reality that 20% is still 20%. And in the end they already 100% the whole damn time but became so blinded by what they thought they were missing out on and lost sight of the truth. And sadly they eventually only saw 80% instead of the true 100%.
Dude, your girlfriend has 100% (that's you) already but she doesn't see that anymore so she's making these shitty excuses so she can find her so called 20% but still have you on the side waiting for her incase it doesn't work out. You don't deserve this man. No one does. Find someone who deserves you. You're young and it's better to be single than have to go through this BS. Because you're always going to be wondering that if you say yes this time, if she's ever going to do this again the next time you're both apart from each other.
The thought that my partner could even consider cheating on me physically or emotionally with another woman hurts more than I can even say and I'm not even dating anyone right now. And in this circumstance, I'm calling it cheating because you're clearly not comfortable with having an open relationship and if she's willing to have sex or fall in love/lust with another person with no regard to your personal feelings then it's cheating.
It's up to you man on what you do. I just wish you the best and I hope everything works out.