DOESNT WANT A RELATIONSHIP?

so my ex and i were together for 2.5 years and friends for 3. our relationship was sooo amazing and he’s literally my best friend. but he told me out of nowhere that he doesn’t want a relationship and wants to focus on himself and his future and figure out what he wants. he broke up with me over a month ago and we still talk everyday pretty much all day. we still say that we love each other and are in love with each other and that we miss each other. but he still doesn’t want to be in a relationship! is he hiding something ? is it me ? or am i just overthinking everything? i’ve tried cutting him off completely but it’s so hard when he’s my best friend. i don’t know what to do!!! help!!