Boyfriend lying for over a year to me !!

So before meeting my boyfriend we had the whole how many people have you slept with chat and he told me one, fair enough was happy with that. But a year later we’ve been together and still talk about it as I have anxiety and tend to overthink the thought of him sleeping with another girl and he’s always reassured me it was nothing. He would say this to my face but today he’s just told me I’m the first girl he’s slept with but he’s told everyone it was some random girl to make himself seem like a lad? Should I be angry at him for lying to me for over a year to my face about an another girl who was his ex but didn’t have sex.... help :(