Stay Away If you honestly can't stand your ex at all and your friend has him around all the time, the best way to deal with it is by staying away. The relationship lasted for about 6 months I think and years later, I've come to realize how silly and stupid I was for having the reaction I did. I thought about them giggling and laughing and kissing and being blissfully happy. I met someone nice, but within weeks I discovered that my ex and my best friend had started a relationship. But it reminded me that being around people who make you feel good speeds the healing process.
Talk it out No matter what, you need to try and have a discussion with your friend.
My Ex is Dating My Friend! How to Handle it and How to Keep From Going Insane
Being honest, showing respect, and having trust in one another is the key trinity to BFFs. Call the ones you know are your true friends. Their relationship is working because of the "scandalous and forbidden" element. You don't' have to be overly friendly to your ex and your friend. I wanted to punch both of them!