I inadvertently became a creepy ex-- I contacted an old boyfriend after 8 years.
That's very concerning, did you guys end things on bad terms?
Yes, I deleted all the pictures of us and broke his cell phone.
While it is common to wonder what an ex-partner is doing after a long time, it is better to leave them alone, especially if things ended badly between you. It is not a good idea to look up or creep on an old ex, you should just leave them alone.
I want him to feel jealous that he ever got me; and I'm going to get him back.
I don't think you should be vengeful, specially if you are the reason why you guys broke up as you broke his cell phone and I think he has already moved on from you, and I do not think it will be healthy for you both to get back together as it can be bringing up old memories of the past.