Search Results: getting past anger

The other day I went shopping with my bf and it was going really good until the shopping centre was getting a bit crowded. There was an older woman with a huge trolley who wouldn't move out of her way to let us walk past, she didn't stop she just kept walking without moving out of the way. I accidentally bumped into her and I said "I'm sorry" and she yelled "fuck you" my bf heard and he screamed "shut the fuck up" then he punched her in the face and she fell down (we didn't see security yet) my bf then took me straight to the train station to go home because he was still angry about the whole thing. I said "I know you were trying to defend me but why did you knock her out" he's like "she pissed me off and got what she deserved I don't like when people disrespect me" I'm now nervous to be with him because I hate fighting :( and I hate seeing people hurt :( should I stay with him? What should I do?

Me and my former boyfriend had been together for one year and three months. He's my first love, best friend, Everything. I never expected to fall in love with him. He changed a lot for me, picked up his act. had never left me hanging. he was always there for me, supported me. he healed me. and i healed him. I felt positive that it was a forever relationship.
However three days ago we got into an argument. we had been fighting a lot the past month.
He came over to my home, and we ended up in a dumb argument. however this time , he complained about how I was flicking at his arm. Because of how he was yelling at me. I - with an attitude- said "i should have slapped you in the face". In the past, he always told me. If he were to disrespect me or accidentally make me feel threaten. To slap him.
He accused that I would never do it. I was sitting and he was leaning down over me. I had enough of his anger over something so small and slapped him. However, moment, seconds later. He slapped me back. I didn't look at him. But yelled at the top of my lungs to get out.
he was escorted out by my brother. and I told my family what happened.
They said to use this time as my break, since I felt that I have been needing one. My "boyfriend" Has apologized, cried, pleaded and admitted that he was wrong, and has said he will start therapy. He said he will do what he can to prove and win me back,. that our relationship is worth more then two slaps.
Its safe for me to say that we were both wrong to hit each other. I will be getting counseling myself.
He's a really sweet guy, the only guy to have changed for me and for the better. but this is a big no no.
Should I wait and Take him back after we get help? Or should I leave?
I still love him deeply, He needs a supporter. This was the first wrong thing he's done to me. Is there any hope for "US"?