Why would he do this, if its not what he wants?

My boyfriend and I have been together for wuite a long time. I cant recall how long because we talked for a very long time and went on dates before actually dating. But regardless about 2 weeks ago he decided he didn’t want a girlfriend and wanted to just be “single.” He turns to me after saying this and says I still love you with everything I have and I will always care about you more then myself but things are rocky right now, we can still be friends right ?

I agreed to being friends because I’m not cold hearted and could handle it, but we would still hang out at least 3 times a week. When we hung out he treated me like his girlfriend again, i.e kissing me, hugging me, telling me how adorable i looked. Then one day it was like a flip was switched, he came to pick me up from my house to go out to dinner and treated me like dirt the entire night. I want to know why would he do something like that, or treat me so badly when all i do is good for him ?