Why's he being mean then nice?

Anonymous
My best guy friend told me he liked me over the summer on a night out before this we had kissed nearly everytime we went out but he had this rule where he said he wouldn't sleep with any of the girls in our group (because with his last set of friends he ended up sleeping with this girl and then sleeping with her sister and it ended badly) so he said he wouldn't sleep with anyone in our group but on this next out he said he really liked me over and over and we ended up sleeping together but then the next week he told me he didn't like me and that it was a bad idea and I shouldn't fall for him cause he's not a nice guy but then over Christmas we ended up sleeping together again and in the morning he let me cuddle him and rest my head on him but then again he told me it wasn't gonna work, then over Easter he was complimenting me but then as I was talking about another guy he seemed to get jealous and even my mate said to me new as jealous and I probably shouldn't talk about other guys in front of him and now he just seems to be ignoring me
Why's he being mean then nice?
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