My question is at the end, but first I need to provide a little context:

I posted on here a couple months ago about this same chick, which you can read about here:

Lying Girlfriend – 5 Year Relationship
general-questions/lying-girlfriend-year ... 94561.html

We basically made up after that situation, and I told her that she would have to earn my trust back. So now the plot thickens… She has been cheating on me since summer of 2015. And the Snapchat account was related, just as I originally suspected. I’m talking about physical cheating here, not just flirting and photos. I stumbled across the evidence just today. At first she wouldn’t admit it, until I actually told her I had evidence. Unfortunately, she’s a compulsive liar.

So I find out that she’s been sleeping with this guy whenever I’m not around, or when we’re fighting. When I asked her how many times it has happened, she told me she lost count: “probably around 10.” She claims that she doesn’t feel any love for him and that it’s “strictly sex.” She said that she “only loves me.”

Nonetheless, this hurts pretty freakin’ bad. This is not just a huge blow to my ego, but to my emotions. Considering this has been going on for 7+ months and I didn’t know about it. And she has been my girlfriend for over 5 years now.

Now my question:

Should I cut her out of my life altogether? Or keep her around as a friend with benefits? Obviously I can’t count on this being a monogamous relationship any longer. But I can’t figure out what to do. What’s the most Alpha-like action I can take here? Because I’m not thinking very straight right now.

Two words: Self esteem. If you have some, the obvious answer is right in front of you.

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It's over. You won't love her the same. And if you do, it will be a very hurtful way back to the way things were. I personally would just ditch her and start fresh. It hurts now, but after you get back into the game and start focusing on your life, you will realize how easy it was to move on.

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You can have relationships without lying and drama. Get out.

The 3 responses so far have been pretty unanimous, but it still hurts like hell. This was an investment of 5 years of my life. Am I just supposed to write it off as wasted time?

No one said it didn't or shouldn't hurt, but you're not describing a girl that's worth your time and you may have given her 5 years too many.

Ask yourself this question. If your best friend, brother, or son came to you and asked you your advice because they are going through the same thing you're going through now, what would you tell him?

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Yes. Keep her as a fuck buddy. You obviously can totally handle that since your emotions are 100% in check and there's absolutely nothing to lose. I mean it's not like she CHEATED ON YOU FOR THE PAST SEVEN MONTHS.

This kind of shit frustrates me. How can you even entertain the possibility of further allowing her to plow through your life after shit like this?

Also no, it's not wasted time. It's never wasted time actually. The worst experiences are your best teachers. Take it as a life lesson and know what to avoid in the future.
There's millions of clueless bastards that end up marrying women like that. Congrats, you're now officially no one of them.

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You make great points. Looking at this objectively, it does appear that I gave her 5 years too many.

That last line actually made me smile, so thank you for that! I need to adopt that "glass half full" mentality with this whole situation.

And owe her not 1 second more.

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Well said.