<human>: Could you distill the essence of the text into 1-3 sentences?

Everything in our relationship is good bar this one icky topic. Been together only 6 months. He is friends with his ex (they went for about a year and broke up a while ago, and it was about a year later that he met me), which is fine; I'm friends with most of my exes too. But for some reason, he keeps lying about when he is hanging out with her, as if he wants me to believe she does not exist. 

Recently he said he was going for a family dinner, but after a snoop through his texts (I know, I shouldn't have) apparently he was having dinner with her instead, but didn't tell me.

I don't know how to trust much of what he says anymore. I know I should talk to him about it, but what do I say? I love him and I don't want this to end but this is hurting me so much :(
<bot>: Boyfriend keeps lying about hanging out with his ex. Do I need to get over it or do I need to get angry?