Ex boyfriend added me?

I have an ex that I dated back a few years ago, we did not end on good terms, in fact before school ended he told me that he was happy in his relationship and that we shouldn’t talk anymore. I said that’s fine by me and I blocked him through texting, but nothing else since we weren’t friends anywhere else. I realized (about yesterday and today) that he had friend requested me on Instagram and Facebook. He has a girlfriend who I know would not be okay with this because he cheated on her with me this year. Yes I do regret my decision to do that, which is also why he’s blocked. Do you have any idea why he would do this?
Ex boyfriend added me?
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