Why would a guy act like this?

Why would a guy message me off of other peoples phones and constantly bring me up to people? It’s been almost a year and I found out that he would constantly bring me up to people and told me he’s had a hard time moving on from me. Mind you, he never told me he had feelings for me and started acting like this after he said he didn’t wanna date me anymore. His female best friend hates me, but he’s okay with committing to her but not me. He also cried the last conversation we had when I told him I didn’t wanna be with him. Why would a guy act like this?
Why would a guy act like this?
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