obsessination
When you're so into someone you'd rather eat a whole pizza box than let anyone else get near them. You're like a fangirl who thinks they're the only one who matters and everyone else is just background noise.
I'm so into my crush that I texted him 'If you talk to anyone else, I will scream your name in the cafeteria.'
My friend is so into her crush that she followed him to the store and yelled at the clerk for not giving him extra candy.
My cousin is so into her crush that she texted him 'I will throw my phone out the window if you talk to anyone else.'