I Have No Choice but to Quit One of My Jobs

I recently got another job one that pays me 15.75 an hour which is way better then my other job which pays 9 and I'm still working at both jobs because the one that pays me more I'm on a contract until December and until then they will tell me of I'm permanent but I want to still have something in case I don't get re hired but most likely I will and my boss at my other job doesn't understand that I'm new and I can't work as much as before and I told him I can only work on Friday which is my only day off at my new job and he puts me to work on Wednesday to get out at 4 when it takes me 2 hours to get to my other job and there's a lot of ft raffia at that time he said well just ask someone to take u but I still wouldn't make it on time Because of the traffic I think he wants me to quit and it isnt fair that he is doing that I need the money and other people there have more than 1 job and he works with then but with me ifs a while different story . I feel like I have to pick which job to stay at tomorrow since my boss doesn't want to work with my schedule. I'm scared they might not keep me but most likely they will but who knows until them that's why I can't leave this job. I don't know what to do