Why would a guy add you on social media after not talking for a while?

I used to help him out a lot with studying for tests and assignments and I liked him back then but he wanted to just be friends and then he got sexual a few times and it was unwanted and that threw me off. I told him to stop saying that stuff once and he said that he will, so I then gave him the benefit of the doubt. He then did it again and I didn’t give him another chance, so I ended up blocking him. I would reach out and ask if he was okay (this was 2 years ago) and sometimes he would either be rude with me or be friendly and it felt like I was walking on eggshells. Last year he found my number and he wanted to talk but I wasn’t interested in talking to him at all and then he became rude with me again, so I blocked him and now this year, he created a new Snapchat account. I blocked his other account and I don’t know how he found me because I changed my Snapchat username and my bitmoji is very different and he somehow found me again and added me. For now, I just left him there.
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We used to call each other as friends, but after he became cold I just let everything fizzle out.
Why would a guy add you on social media after not talking for a while?
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