Is hacking his facebook too much of a revenge?

[Allison]

Im 15 years old on my 17 year old ex boyfriend has been playing games with me for 4 months. I finally ended everything with him and to get back at me he is telling everyone my secrets and trying to make me jealous of him and his new 14 year old girlfriend. But back when he actually liked me, he gave me his Facebook password which is also his email, and twitter password. So to get back at him for everything he has ever done to me, i got on his Facebook and made his profile picture two guys making out, i posted "We are never getting back together" by Taylor Swift on his wall and a little bit more. Nothing else too big. Did i do too much?