iphone 6 screen

A few months ago, pink lines started appearing all over my iphone 6 (bought in June or July 2015) screen on anything that was white. I didn't bother much about it at the time because I soon got rid of the lines by turning on night mode (it sets all colors onto a warmer side, so the pink lines...

So about 5 minutes ago, I pulled my iPhone 6 out of my pocket and I saw that the screen was completely cracked. Like absolutely 100% cracked. This was not here before. Earlier, I sat in a car from point A to point B on my phone (20-minute car ride). It was completely fine then, no hairline...