should I respond?

So my Bf and I had been having some problems. I found out from a mural friend that he was entertaining another female. He had bought her gifts for Valentine's Day and they had gotten pictures taken together. The girl had disrespected me by talking about our child that we lost. He is now having issues with her and calling me again. He called me like 3 times on Saturday but I didn't answer. I'm dying to talk to him. Should I call him back?