Broken up with ex-girlfriend - she's already slept with someone else

Hi kind readers, I don't usually like putting my problems on other people but I'm seriously lost and confused at what to do so this is difficult for me please understand. I would appreciate firm advice, please don't sugar coat I need to hear it how it is. Basically me and my ex-girlfriend broke up about 2 weeks ago, I tried to ignore her for what I believed was the healthiest thing for me to do as she really hurt me. Don't get me wrong it was a great relationship at first, that's what makes this so difficult because I can't help but think of the good times. But it got worse and worse and a huge issue was I trusted her less and less. We broke up a few times, she never cheated on me I'm sure but every time we broke up she would almost immediately go and console in another guy. In our 3 or 4 breakups she snogged 2 guys and had 'cuddles' with one of the same. It really hurt, but I love her so I overlooked this. I told her how I felt about it, how much it hurt me but the last time we broke up was over the same thing again. I was actually in her room on her bed after a huge argument and she gets on the phone to arrange to go see one of these guys, claiming he's only friend when I questioned it, she needs to see a friend etc. It ended very badly after all this and we didn't speak until recently. I've now found out within only 1 week of our breakup she's actually slept with this so called friend and I'm absolutely devastated, I feel heartbroken. She says she's sorry, she didn't know what she was thinking, she's telling me she loves me and wants me back, I feel like if she really loved me that much she wouldn't have done that, and SO SOON! I'm heartbroken, I don't know what to do, should I talk about it and try and sort it out? Should I cut off communication because it hurts so much and that will be healthier like I thought before? Is she worth it or not? Or something else?

We can say what we like..word are nothing...actions speak, and they don't lie,...and her actions have spoken that many times. You're heartbroken..you put more into the relationship than she did. She says she's sorry?..I doubt it...she'll just keep on breaking your heart. We all think of the good times when relationships falter and end but we need to understand that they're just memories not reality. There's no grey areas here, it's black and white and for ALL to see...she's bad news. Save yourself...ignore her and get on with your life...find a woman who respects you for who you are. Remember this, when the right woman comes along, you'll know it...it doesn't matter what she looks like, it's whats inside that'll count.