Should I apologize to this guy that my 2 friends harassed in HS?

All of us are 26 year-olds by now but this has been bothering for some time. I know who he is and have seen him a couple blocks near my workplace.

We only had him during our sophomore year of HS. My two friends (I'll refer them to Alicia and Jenny) and I would do our surprise greeting from behind. I would only blow his hair or lightly tap his arm sometimes and other times I would watch the things Alicia and Jenny would do, stand there and do nothing. Jenny and Alicia used to touch him a lot or rub themselves against him. They would make him carry their stuffs to classes too. He wouldn't speak much to us. A couple times when he would see us at the library (from far), he would be leaving as if not wanting to bump into us.

The places Jenny and Alicia touched him were his shoulders, his bottom, thighs and even his groin area. I always felt that was going too far but didn't know what to say nor how to react under such situation so I said nothing and instead smiled or laughed along with them. What they did was obviously harassment. We have greeted each other recently a couple times but nothing else. Should I apologize or mention anything about it? Is there a chance he might still feel a discomfort or something because of what my friends did?

Should I apologize to this guy that my 2 friends harassed in HS?
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