I was dating this man for 4.5 months and received a call from a woman saying she is his girlfriend of 1.5 years? He admitted to having sex with her?

rosewood

I asked him if we were exclusive a few times and he said yes over the course of the 4.5 months. So he lied to me. He continues to send me pictures and messages via text. Should I understand his confusion and forgive him?

Updates
5 mo
After his girlfriend's call, he said she broke up with him and would not leave him alone. He also she came back into his life 2 months into our dating because she heard about me. He still kept this information from me. He knew I would stop dating if I knew so he was still dishonest about that.
I was dating this man for 4.5 months and received a call from a woman saying she is his girlfriend of 1.5 years? He admitted to having sex with her?
6 Opinion