Who was right and who was wrong in this situation?

Today I came to play basketball at a school and at the school were many young teenagers just hanging out. As I was playing basketball, I noticed that many of the youngsters were throwing water balloons at one another, but I continued to play basketball minding my own business. As I was playing, one teenager went p me with a water balloon but suddenly threw that very balloon at me for no reason and ran off leaving a pair of shoes behind. I became furious and didn’t know what to do. What I ended up doing was picking up his shoes and throwing it down a little hill. I felt guilty and went to go pick up the shoe. I brought one shoe with me and continued to play basketball. A few minutes later a girl from the group came to apologize on his behalf but I didn’t accept and refused to return his shoes demanding an apology from the person who threw it at me. At this point God was definitely testing me on how would react in a certain situation like this. Overall the wrong person was I who threw the shoe over the fence because God wanted to test how I should have reacted in this situation . I gave the shoe back, but felt guilty for days and I cant stop thinking about what I did. Jesus once said that If one person slaps you in the right cheek let him hit the other side as well. I felt really immature because afterall it was just a water balloon, but instead I took it as a bullet shot. A wise person, unlike me would have not allow this situation to get out of hand, but I did and I feel so guilty, not because of what I did but by letting God and our lord Jesus Christ down. This is not a true act of Christian testimony. You tell me who was right and who was wrong.