help...

first of all, sorry for my bad english... 😳
i have a problem. i'm 19 years old and i have a boyfriend for 9 months now. there was never a problem between us, but i found out that he lied to me. he told me at the beginning of our relationship that his ex's cheated on him, so he didn't trust people easily because of that. i believed him.. like why would you lie about why it didn't worked out between you and your ex. but okay yesterday i found out that he lied to me about this. his ex never cheated on him. they didn't know why they broke up... he told me he hated her and he told me he didn't talked to her anymore before our relationship for more than 6 months. this was a lie too because he told her he still liked her and wanted her back 1 month before we got a relationship together. he still has pictures on his phone from conversations between him and her en i saw a conversation between them on messenger en that wasn't fun to read 😢 i just don't know what to do right now because i love him but i just don't trust him anymore and i don't get why he's lying to me... helpppp