Will he be convicted of burglary even though there's no evidence ?

Hello. Im Bri and i really need help. My boyfriend goes to court on June 1st for a crime he wasnt involved in. Right before he picked up his friend, his friend robbed a man of his iphone. My boufriend picked him up but did not know that he had just robbed somebody. So when they arrived to my boyfriends sister house and came back out the house the police surrounded the house and arrested them both. My boufriend had no clue what was going on. The boy hid the phone in between the couches inside the house and still denied that he hd nothing to do with it. I just want to know, when he goes to court will they sentence my boyfriend for anything even though he had no clue what was going on. If so what will they sentence him?