Oh no... In the past version someone reported it as having a trojan that was nowhere in the files so I hope that didn't happen again. (When it did, it made everyone's windows go crazy on it) While I'm not the one who made the offline player, it has been run through sandboxes several times and people can't find anything like that. I can vouch for the coder but I am also a biased source. (I also didn't personally upload about half the current download links so something else could have been put in one of them?)
The % chance of being caught may be too low but any action you take with Megan like kissing or grabbing her will start a ? timer. If you let that timer run out it will cause an autocatch. I went to go check if my timer skip version accidently deleted one of those but they all look good to me and I was able to trigger it just now. They are 20-40 sec each.
Sorry I missed this question. No they don't vary with how many texts you missed. However, there are a few other small scenes that deal with it that have nothing to do with texting and calling. It probably doesn't "count" but you should also watch the male fiance ignore ending which is a hetro one with a nice character crossover.