Pranking someone you used to date.. is it ok? Any more ideas?

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Ok so I used to date this really controlling guy. The first time we met, he was with someone else and got my number through her. They lasted for 2 months and during that time I've only talked to him for 30 minutes through those months. Then I went off for the summer hols, came back and he kept wanting to meet me. We did meet but I didn't know it was supposed to be a date...then on the second day he told me he really likes me etc although I told him I'm still not over my ex. THen he just came to study, watch tv and hung out at my place everyday and i mean every day. I stayed with him just because I felt pity for him that he seems to like me so much and I was still lonely cuz of my ex. Then, they met one day and he insulted my ex really badly while he didn't do anything wrong. I asked for a break, then, when the break ended, he kept calling me, asking to see me. I told him that I dont want a relationship anymore, just friendship. He told me, "I'm only friends with beautiful girls because then maybe something will happen. I cannot be friends with girls cuz then I'd want something with them. I don't see what I did wrong". I told him that he has always been trying to change me, the way I dress, doesn't like it if I hang out with my guy OR girl friends, gets jealous of every guy/girl friends I hang out with, is obsessed with the feminine body. He still denies everything and tells me that it's all my ex's fault. Then at one point, about a month after, he sent me an email, asking to be friends again and that he now has a gf etc etc and doesn't understand why I want to break up with him. So I sent him an email, giving the same reasons as before, and told him to stop bringing up my ex as an excuse to complain etc... then he wrote me a really nasty email, saying that i'm wasting my life studying what I'm studying, calls me a b****, says that his friend thinks that I'm a stupid girl for missing my ex etc and sent me 3-4 nasty sms on the same day. I simply replied saying please stop bothering me. He wrote back again saying that I have no friend, that I'm stupid and when would I stop bothering him? I once saw him again in a student building while visiting a friend but the guy just slams the door. After all this, all my anger is bottled up so much that... I started using his e-mail to subscribe to random newsletters....EVERYWHERE on the net that I can find, on gay dating sites (no offense to gay people, I just want to get back at this guy), horoscopes and lots more spams... What do you think about this? I think he deserves it because I hate men who just like women's bodies and love to use them and nothing else. If you agree with me, anymore ideas of how to prank him? If no, why?