Boyfriend lying about past girlfriend

Bryoni
So I've been with my boyfriend 7 months and when I first met him he told me he had this other girl before who he had met online and but she lived in America so he hadn't even met her but he would talk to her everyday and he said they really liked each other but sadly she died. That's what he told me anyway but yesterday he told me that she wasn't dead and that she had just broken up with him and left him for someone else's and she is now married with a kid. He kept saying last night how he loved her so much and they were sold mates and it made me feel a bit like he still had feelings for her... But maybe I'm just being paranoid. Anyway should I be annoyed that he lied to me all this time? Or be happy he could tell me the truth now? The thing is I don't know why he didn't just tell me the truth... :L I don't know what to think....