Currently away from my LTR on a trip home to my family. Left two weeks ago, she gave me a limit of three weeks (which I laughed at and told her I'd take as long as I need). Today she asked me when I'd return and I said next Monday or Tuesday. The following is the conversation that ensued (add in hearts after every of her messages):

Her: "But I miss you soooo much. Three weeks was my limit"

Me: "Chill out. I barely left two weeks ago."

Her: "It feels longer to me :("

Me: "you'll get me back soon enough ;)"

Her: "yesss. so can you tell me the exact date? It would make things easier for me"

Her (shortly after): "and of course I won't cheat on you in case you think that, not even if you stayed for another four weeks"

Her (directly after): "but of course you shouldn't stay for that long XD"

What did she mean by that? Why would she tell me that "she wouldn't cheat on me if I stayed away longer"? Seems like a totally unnecessary thing to say if she didn't at least think about doing it. What's the deal with that message? Am I just overreacting or does this seem fishy to anyone else too? Maybe that's relevant, she still has contact with some male friends of hers which I explicitly permitted since frankly they don't seem like much of a threat. Before I left, sex was great (two or three times a day), she was the one to always ask for our next meetup and she was very clingy.

I just ignored her last two messages and responded to her first, telling her again that I'd return on the 5th or 6th. She replied with "ok fine" and a heart and a few minutes later with "everything alright?" with a heart again.

So two questions: What's the deal with her message and how do I proceed from here?