Usually this means their family members. Children don't know which behaviors are okay and which are not, unless they are taught. So, it is easy for children to pick up bad behaviors as well as good behaviors, without thinking about it. No parent sets out to deliberately teach their child bad things, they don't have to. They set examples when they do things they should, and when they do things they shouldn't.
Children often follow the examples.
But, now that you're aware of this problem, you can change this bad behavior. Think about what happens just before you lose control. Often jealousy triggers abuse. Jealousy is about controlling someone else's behavior - you don't want her flirting or talking to another man. But there are other situations which trigger a feeling of loss of control over another person.