This show, I had so many thoughts about it. I both thought the guy was too old to be dating a fifteen year old, and also that the mother should have gotten to know him a bit. When you're that age you think no one has ever loved this way before, so deeply, do truly. Of course it's nonsense, and any teen who isn't dumb from hormones should realize that you're not the only two to be 'in love.' Any parent would know the more you say no, the more in 'love' that you are.
To be honest, I'm glad they decided to end their own lives and not kill parents.