Battery and Consequences

My question involves criminal law for the state of: Iowa

I was recently involved in a fight at work. We are both male, and he grabbed my chest, specifically my nipple, and I got angry and hit him with a glass. It didn't break and I wasn't strong enough to hurt him above a slight bruise to the shoulder, if even that. He apologized for upsetting me and didn't want get me fired and we ended up talking shortly after I hit him. He didn't move or appear angry at me so I stopped after the first hit. I had confided in him that it made me upset for him to touch me. My manager of course fired me.

I'm a college student who is also a novelist and fluent in multiple language.

The cops were not called but I thought it might be useful to know proper procedure and laws in my area for battery charges (I hit him with his back towards me and did not make any threats before, during, or after the fight).

He seemed like a really nice guy after the whole incident and was trying to save my ass in the end. He told me it was all just a misunderstanding, and that he usually jokes with everyone that way. I of course, was not of the same opinion, and when he had previously touched me before, I threw him off violently, cursed, and looked at him angrily because I was. I assumed he would have gotten the point after that.

Could you please divulge me in the possible charges and or penalties for conviction? I plan to apologize to the guy if I see him. I just sort of "snapped" at a really bad time.

Oh, and some more information about the fight. We don't know each other at all, other then that we work together. He explained that it was a misunderstanding, and that he jokes that way with everyone. He's grabbed me before and I threw him off of me pretty violently and curesed at him. He would sometimes just look at me and say curse words under his breath and is a strange person. I wasn't sure if he was making sexual advances, which, I would have assumed he would have gotten the point since I would rarely even look in his direction.

I assume he won't involve the law simply because he doesn't seem to be that kind of person. Also because he didn't even get angry when I hit him and tried to save my ass in the end.

You were sexually assaulted, fought back and were the one fired?

What happened to the other person?

What he did to you is sexual harassment. I would have a meeting with the HR department, and point that out. You may even want to bring an attorney.

For clarification. Yes he grabbed my nipple, it wasn't the first time, but the second. When it happaned the second time I shouted the "f word" then grabbed a glass which wasn't too far away since I work in a restaurant, then hit him on the shoulder though I was aiming for the head. I instinctively waited for him to retaliate before continuing. But he didn't get angry and apologized so I stopped.

I'm not sure what happened to the other guy. I assume they told him to go home. The manager got me and told me to go home and come back tomorrow. I would naturally assume that I am fired. Violence in the work place goes against any companies policy. The conversation with the manager went like this:
Manager:
"I don't know what happened, I don't want to know what happened, but you must understand we can't have fighting in the work place. Jesus Christ, you hit him with a duke?! (Tall glass mugs we use for serving beer) We could have called the cops."

Me:
"He started it when he grabbed chest. It really pissed me off."

Manager:
"You could have told a floor manager."

Me:
"I took the only option I saw available at the time."

Manager:
"Just go home for now."

I plan to quit even if he were to offer me my job back under any and all circumstances. I am mentally and physically undamaged from the whole ordeal so actually sue-ing is a very unattractive option. Especially since the police was not notified.