Why is my ex apologizing now?

Why is my ex being nice all of a sudden after 6 months of no contact? He called and apologized for everything he ever put me through and said to me. He said he doesn't like where he is now. He kept saying how he wishes he was close or still living here. He said his life has been really stressful lately. He lives in another town with his girlfriend who he got pregnant after a couple months of dating. We broke up back in December by the way. So I'm just wondering what's going on with him?
Why is my ex apologizing now?
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