My GF is a compulsive liar. In the 14 months we've been together, she had lied to me countless times. Should I dump her?

McSimillian
My GF is the social type and perhaps too social especially with guys. And it really gets on my nerves when she's get too intimate with other guys.

A few months ago, she's been flirting with random strangers on the Tango app. I found out and asked her to confess. She lied as expected and I had to take her phone and show her the evidence. We argued, she apologized and I deleted the app from her phone.

2 months later, she secretly re-downloaded the app and repeated her mistakes AGAIN. I eventually found out about it, AGAIN, asked her to confess where she lied, AGAIN, and ended up arguing AGAIN, which was last night.

I have not replied her messages and calls. I'm still pondering about my response hence this question. Coz everything we argue, I would said that I'll dump her but then ended up forgiving her. She probably think I will give her another chance like I always do.

Other instances when she lied was meeting and flirting with other guys on online dating sites and many other social apps.

Her usual excuse would be that she's just looking (at the photo of other guys). Then I'd have to show her the chat log evidence and she will use excuses like; I totally forgot about; it was a long time ago, I'm not doing it anymore; I regret doing that.

She seems to be the type to cover a lie with another lie. Even though I have said that I'll forgive her if she tells the truth. However, she never choose this option and had to make things difficult for us. I have a strong gut feeling that she will repeat the same mistake again in the future if I forgive her now.

She's a compulsive liar, and I honestly believe that this part of her is impossible to change. However, I'm fine with every other aspect and truly love her as my GF.

TL;DR: I hate lying, GF can't stop lying, I love her but she won't change. Should I dump her?
My GF is a compulsive liar. In the 14 months we've been together, she had lied to me countless times. Should I dump her?
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