Should I apologize for behavior in past relationship?

I've been looking back on my years of high school, and I have been thinking in particular about relationships, primarily my first boyfriend. I'm a senior but this happened my freshman year. We met during band and he ended up driving me to Ihop after a football game. He asked for my number which I gladly gave him. We texted over thr next few days and after about a week we were secretly dating. We were both kinda in the closet. (He is no longer but I still am) The relationship was fun and there were new experiences in it for both of us, but I started to notice his poor hygiene, got a but freaked out after his family began to recognize we were a couple (his dad was an open bisexual and had relationships witg men in the past) and I couldn't do it anymore. We broke up but we were friends for about a month after. Then the fact we dated got all around the school because of a friend he told that he said was trustworthy and I was pissed. I said some horrible things to him and told him I wasn't actually into him, and that was it. I've seen him a few times since but it's always been awkward. A mutual friend said he wasn't over me for a while and that the stuff I told him hurt him. It's been several years since but I am wondering if an apology would be appropriate.