He Lied To my face.

Yesterday I asked my BF if he kissed a girl, he told me no. Little did he know while he was sleep she texted his phone asking " Why did you kiss me last night ?" So I knew the answer. I was furious when he looked me straight in the face & lied. I'm so annoyed and I'm honestly thinking about ending the relationship. if he'll lie over little shit, he'll lie regardless.  What do you ladies think ?