Need a little boyfriend help?

hi, i had recently become boyfriend and girlfriend with this boy at my school. Today in gym cl we have to walk, run, jump rope, etc. anyways today i was really tired and i only walked 2-4 laps. I sat down near the bleachers where my boyfriend came over and sat next to me. He said: "only 3 laps? what are you lazy?" now he does cross country and sports so he is sorta into it. I responded "no" does he really think im lazy? and should i join him with other sports just because i love him? i don't know. Thanks