My girlfriend has started cheating, please help me!

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I have been in a relationship with my girlfriend for 3 years and I thought things where going well.

One day I noticed that we started drifting apart, I asked her about it she said nothing was wrong and I believed her.

She started coming back home later than normal so I decided to take the initiative and check her phone.

Woman gives birth to twins with different dads after cheating on husband

What I found shocked me! There was a sex tape of her with another man and I had never heard her moan like that when we where in bed.

I still love her and I don’t know what to Do. Pls give me advice.