Will i be better off on my own?

Its not fair to you or him to stay just because you don't want to see him with other girls or because you scared to be alone. You said you don't enjoy being with him and your not attracted to him anymore, that should be your answer. Your unhappy and its not right to stay because you say you don't want to hurt him. Im sure it hurts him when you cheat on him and text other guys. If i were you i would end it.