Break up or?

My boyfriend and I do nothing but argue, I don’t feel anything for him anymore. I was thinking of letting him go but we’ve been together before and when this happened I broke up with him and he decided to find my ex online and become friends with them . My ex had no idea, he did it to get back at me for not feeling the same way he felt about me. Since I already know his intentions I wonder what he would do next time. Which is probably why I held off with ending things. Any help ?