Why would my boyfriend lie to me?

Anonymous
hey everyone, my boyfriend and i have been together for 8 years. when we first got together we only knew each other for a month till he asked me to be his girlfriend. in 2017 he spoke to this girl while he was on a work trip to Texas. i only found out bc i snooped through his phone. i kept brining it up and asked him why he did it all these years. two days ago he told me she passed away and to leave her alone. it didn’t sit right with me so i got on facebook and i messaged her saying hi and if her and Jorge every had a thing to my surprise, she responded saying this is random but no. i called him and asked him how he knew she passed, he said bc a friend of theirs told him then i told him how i knew he was lying. he then told me he only said it bc i wouldn’t leave him alone about her then told me i’m bitter and i’m depressing and i should go ahead and break up with him. i agreed and we broke up. that wasn’t the end. he than texted saying he just wants to see me, i love you and then calls me twice. i ignored him.
Why would my boyfriend lie to me?
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