I really don't know what to do I'm caught in between two friends
So I have a really small group of best friends, were all really close.
One of my friends, Melissa, has been dating a guy for almost two years now but he cheated on her with one of our other friends, Jenny.
Melissa has no idea about any of this and I'm caught in between. I can't tell melissa because it will ruin their friendship and Jenny trusted me.
And plus this guys a really big douche bag, I know he cheated on her with other girls, although I have no proof its pretty clear to see.
I can't tell melissa about any of this but I feel so guilty and I just can't see him with her anymore. If I tell melissa about the other girls there's a big chance jenny will get caught and everything will be a disaster.
I don't know what to do, is it best if I just don't get involved?

In a situation such as this you can only do what you feel is right. This is where you decide who you're true friends are, because you can either lose one, or them both.