Infatuation is a powerful thing. You could meet someone, fall in love, and want nothing more than to declare in front of everyone you've ever known that this person is the one with whom you're going to spend the rest of your life. It's beautiful, and the kind of commitment you can't take lightly.
So how then can you go from that level of love and commitment to saying, "I want you out of my life so bad I have to get you out of my life"?
Well, these people from the internet are here to tell you.
Here are the stories from an Ask Reddit thread entitled "Redditors who were dating someone that went from 'I think I want to marry this person' to 'I think I need a restraining order', what happened?" They're all real stories of real people explaining how the biggest of relationship shifts could happen.