Should I apologize to this certain guy?

This might be a bit confusing and long but I’ll try to explain it the best I can.

So last year I met this guy and we became friends pretty fast. It was with the tipical “want to sit with me at lunch?” kinda move and I met with him everyday for a few weeks. We then exchanged numbers and started talking online too because he seemed like a nice guy. Then we started opening up to each other and we realized our childhoods were exactly the same. I won’t go into detail but we came from shit families and I clearly remember him telling me “I hope you never get betrayed the way I did”. So more weeks pass and I realized this guy is kinda strange and is very clingy. When he sees me he’ll always come up to me and talk, and never. Stops. Talking.(I am very introverted and I dislike talking) It was to the point where I had to force myself to seem interested or happy with him, and I might seem like a huge bitch but even though I started thinking negatively about him I stayed friends with him and we shared more information about ourselves. I knew I shouldn’t be but I never met anyone who understood my shit family. By the title of this you probably know what I did. I got the cheapest way out and when he said something just a little offensive (which was saying my friend I had for 3 years didn’t seem good for me to be around) I pretended to seem hurt and told him to stop talking to me.

Months later I regret it and he’s in my PE class (I’m in high school) now and It’s so awkward with him around me but I kinda just want to be alright with each other again. I feel like I betrayed him so he’s probably mad at me or just doesn’t give a shit and makes fun of how arrogant he thinks I am. I don’t know if I should apologize because I don’t want to seem desperate. Should I? I just have no idea what to do. At one moment I’m confident in doing so but then when I think of his reaction to it I think it’s just better to keep silence.

Should I apologize and/or how?