If you just say one lie does it mean the end of a relationship?

Anonymous
We both are seeing each other from past 3months everything is good but sometimes he just fight with me for very silly things and just literally say mean things but I just understand him and leave it. But I m friends with my ex because he's my best friend before and he's the only person whose there with me from the beginning no matter what.
But as I love this guy I really felt wrong in talking to my ex because he dont support those things. So for one last time we met down of my home in car for around 30mins and I told him it's better we don't talk he's like ok stay happy I will always be there. I didn't say this to my boyfriend because I know he won't take it well.
But that day I took a snap of the car just the car and saved it and today my boyfriend saw it and he's accusing me of cheating him and he literally cursed me used bad words saying I m a slut and a bitch in front of people when we are out.
I just did it for us but I he just never understand me and he's accusing me of cheating I just don't know what to do. I just feel hurt.
If you just say one lie does it mean the end of a relationship?
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