Most Helpful Girl
Sounds like he had a disorder of some kind.
Its never normal for a college guy or girl to fuck around with high school kids. That is a key sign that they are not socially developed at an age appropriate pace.
When I was in high school pedophiles would always try to pick up the 14-15 year old girls. They thought it was "cool" to date a college guy. And that the guys wanted them because they were so "mature" when in reality the college guys were creeps who couldn't get girls their own age because they were fucked in the head.
Learn about mental illness and disorders. It isn't normal when someone doesn't have ANY friends of their GENDER OR AGE.
Learn to see a predator and learn quick. There are plenty of men and women who are pedophiles, gold diggers, just after sex, or trying to manipulate or control you.