My man called me his ex name....

Nicole
My boyfriend/soon to be daddy (just found out I'm pregnant) called me his ex name... He did before during argument but i forgave him. But today was a good day we were headed out to go canoeing n he called me her name :( he hasn't been with her in 4 years, i don't see why he called me her name. Am i being emotional or what? We only been together 4 months dating 5 months