What does it mean when my ex contacted me after 1 month of no contact?

Anonymous
My ex dumped me over text message in May. We were never officially in a relationship. The reason why he dumped me over text message was because he told me that we can't be in a relationship unless we have sex. After he dumped me over text, he hasn't been texting me as much as he used to and I haven't seen him since May. After having 1 month of no contact with him he recently texted me saying that he misses me and he told me that he misses how close we used to be. He also told me that he wants to be friends with me and he wants to hang out with me again. Why would he want to be friends with me and hang out with me after he dumped me over text message in May? Is it a bad idea to be friends with him after what he has done? How should I deal with this?
What does it mean when my ex contacted me after 1 month of no contact?
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