Kids say stupid things, especially 13 yr old chicks with cellphones. Now here is the question, what is a 15 yr old dude in high school doing texting a 13 yr old girl back and forth? By the time you are in high school, you are focusing on the high school girls. Not middle school girls. I know three yrs is not a lot, when you are out of school, but in high school, and you are 15, and the girl is 13, that is considered "weird" and places dude in the loser category. Think about it, at 15 now, or when we were, Did we want to associate with 13 yr olds? Take them to Homecoming as a "date" (not saying he was)? Hell no! Now, unless he is family to this 13 yr old, he has no real reason to be really associated with her.
So this let's you know of his mental state, not due to PTSD, but dude was probably effed up in the head anyway. Anybody that does what he did, usually is.