What does it mean he wants to catch up?

Anonymous
A couple of moths ago my ex boyfriend broke up with me. At first, I did not hear from him for about 1,5 month. Then he sent me an e-mail that he thought it was the right decision, but still wanted to see me. We met shortly for one time, he was emotional. After that we haven't had any contact either, except for one time at a party, but we didn't talk, although my friends told me he kept looking at me. Now, about another 1,5 month after the previous meeting, he sent me another e-mail and asked if I wanted to meet to catch up. I think I still have feelings for him and want to protect myself, so I answered to better not do that. He replied that I had to let him know if I feel like it... So, what does it mean if an ex boyfriend wants to catch up? How do men think about this?!
What does it mean he wants to catch up?
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