As much as it hurts, you gotta rip the bandaid off quickly. If you do it slowly, it’s far worse. That is what you have been doing. As much as it hurts, you have to cut all contact with her immediately. This person is not good for you. She is jerking you around but you are letting it happen also. The only thing that helps in these situations is to get some perspective. The way you do that is to get some distance. You and she continued to text even when she told you she was in a relationship with him. Being bored is not a good enough reason to continue to contact someone, especially someone who left you during your relationship to be with another man. So now, you need to do the hard work of separating from her. She apparently has no trouble playing the two of you off each other. That situation is not good for you. You have to set limits and say no. With some time, you will regain your perspective and feel a lot better. You might even wonder how you could have stayed with someone who did not treat you very well. Spend time with family and friends, stay active, do not respond to her texts, email, calls or facebook and delete her number. Just end it completely. She is not good for you and you have to take care of yourself now. And by the way, he didn’t ruin your relationship, she did. She left your relationship to be with him. You really need to be good to yourself now.