What should I do?

so I will try to cut it short, my ex boyfriend broke up with me but we became friends back.
I still love him and want him back, he has been acting unpredictable, sometimes he'd be sweet and initiates contact and text each other for like 2 hours, he'd sometimes takes my opinion about a t shirt to buy whether it looks good on him or not, and other times he'd act so cold, I don't know if he still has feelings for me or not especially he's busy with his exams rn so I really can't predict anything or know what's going on his mind lately. soo what do you think guys?
What should I do?
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