cheating boyfriend

So I've been with my boyfriend now for about 5 months now. He cheated on me once and admitted about it to my face I live with him and his family and my phone is on his parents plan. Also I've found messages that don't seem to Be just friend like between him and other females (I haven't confronted him about them yet). I've known him for 7 years and I gave up living with my ex and his parents and having a stable home to be living with him. I honestly don't know what to do do my friend said I should leave him and that I could come stay with her and her fiancée and they would take me back and forth to work considering I don't drive yet. I'm not quite sure what to do since I have no money saved and I just recently started this job. Does anyone have any advice?