My worst fights that could go on for hours and sometimes days and reach literal breaking point, as in things were broken, were with an ILI. hahah Um I bolded things that sound just like him. He did not usually confront things right away though. This guy would plot his ultimate revenge. Sometimes he took his revenge on others but most of the time I could talk him down. His revenge was not physical. It was coldly calculated to fuck the person's life that he believed wronged him, in the hardest, worst way possible. Thinking back he was probably the most diabolical person I have known, next to me.
I got him to celebrate valentine's with me like 2 times just to prove that I could. I am not into it either but he was so anti-valentines and anti-marriage that I wanted to teach him a lesson.
He ended up proposing to me on my birthday one year because I think he was afraid of losing me but he used the pretense that it was so I would have health insurance, so romantic.
I got two engagement rings from him during the time we were together but we never dared talk about really going through with it or making any kind of plans. Guess it was all his way of staking claim to me without the full commitment and I was cool with that. I even stopped wearing the rings within weeks of getting them and he never cared or mentioned it.
I won't attempt to type him but I will send you a pic of my ex and you can see what you think. He is like a textbook ILI by description but of course has his own unique flavor. We got along really well too. Like when the fights stopped we started to debate without anger but it took a good part of 3 years to get there. In a way when the fighting stopped we kind of grew apart though because we spent all our time pursuing our own interests and even though we lived together we would im and email each other instead of talking, toward the end. :/
He hated working and anything to do with working unless it brought a lot of money. His family was rich though and he did not have to work for most of our relationship since his parents helped us out a lot while he attended various universities. I was always moving somewhere with him to follow his interests while he made me quit my job cause he was so jealous and possessive of anything he considered "his". He did not like to share anything he owned, with anyone but me. He was an only child so that could be the reason for that. We were together 24/7 for several years with limited contact with others since he hated socializing more than I did. I lost contact with most of my friends and family for a good part of our relationship but all in all very worth the experience.
Edit: one other thing I remember is he seemed to have absolutely no traditional morals but the thought of someone hurting an animal made him very outraged, especially if it was his cat. The only time I saw him cry was when his cat died. He didn't even cry when his dad died.