Why do you box/what do you look forward to when sparring?

I'm 65 now, but loved to spar and utilized a defensive mode. I'd take steps back, stop and counter, turn, sidestep and hit and not get hit. I had no desire to be the agressor, just enjoy the technical aspects of countering, parrying blows and trying to successfully slip punches. Had loads of fun with this. I was 6'1" and 215 lbs. in my longer days. Was sparring with a guy who was probably 5'8" and 160 lbs. He hit me on the left temple, without us wearing headgear and my head hurt for days. Once again proved to me, NEVER UNDERESTIMATE YOUR OPPONENT.