My (33) Girlfriend (31) cheated me with her married office colleague

I had a 10 year old relationship as I met her in college. For the first 9 years we were not committed as she wasnt ready to commit. In 2024 I found that she is seeing someone behind my back and that guy was a Casanova. When I got to know I asked her for exclusivity. But then she rejected me and continued meeting him. But in the mid of 2024 she got to know that, that guy isn't interested in marrying her. Then she came back to me and I accepted her since I thought let's give her a chance coz I really love her.

Then she told me that she wants to marry me and we planned on marrying in 2025. But in April again she said she doesn't have feelings for me and again left me. But now I got to know that she is dating a guy in office who is already married. It's like she is actually waiting for the guy to give divorce to her wife and then she will marry him. But I also know that guys wife. So she came to know about this thing and she asked him to stop this all and he told her that he would stop dating her.

On the other hand this guy is promising my ex that I will divorce my wife 100% very soon. So this guy in reality is playing both the girls. He is lying her wife and also lying my ex.

In all this it took me 7 months to realise that my ex is not the right person for me. I have seen her do this with me three times now and have realised that it's very difficult to trust a person specially in today's corporate world. There are soo many cheaters roaming around.

Now it has come to light that the whole office has come to know about their relationship.