I get heavy in it
You're so into something you start acting like it's your whole life and you can't stop talking about it.
I got heavy in it with that new movie. I watched it three times and even told my mom I was going to marry the main character.
She got heavy in it with that guy. Now she texts him every hour and even talks about him during lunch.
He got heavy in it with his new phone. He showed it off to everyone and even took pictures of it in the bathroom.