Need some advice

I recently found messages in my bf phone from an ex i dont know wether or not to believe him that they arent still talking so i told him to give me some time to think and finish my last two weeks of school amd when i get back to our hometown we will talk but the thing is he uses my car to get to work amd i planned on telling him to give my mom back my car til i get back but hes in a boot right now from a fractured ankle , idk should i say fuck him its his fault for putting hiself in this situation so catch the bus or would that be messed up.