My boyfriend broke up with me 2 months ago but now he watches all my posts on social media, and changes his profile picture as soon as I change mine?

My boyfriend broke up with me 2 months ago without any reason. He said “it is not easy for me to think about this bc I was loving being with you. I believed that we could make each other happy for a lifetime. But we are different in many ways. You will find someone better than me. by the way I don’t plan on dating anyone, being single for the rest of my foreseeable future is the choice”.

What does this mean?

My boyfriend broke up with me 2 months ago but now he watches all my posts on social media, and changes his profile picture as soon as I change mine?
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