My now ex boyfriend’s mother recently passed. With the worsening of her cancer, he became more and more detached and asked for a break from the relationship with intentions on getting back together soon. We dated for 2 years and were on the break for a few months but were still talking and seeing each other. Our relationship started when we were in high school and continued on through college. Towards the end of her life, we would visit his mom together in hospice and the hospital. His mom and I were very close, and she always said I would be her daughter no matter what happened with our relationship. She was the best listener and always had comforting words when her son and I were at odds. When she passed, he said that he couldn’t be in any type of relationship anymore. I was obviously heartbroken but understood the situation. He apologized for it causing me any pain and said that he hoped we would be together when he is ready. We have clicked from the beginning and truly had a great friendship beyond the romantic aspect of dating. We have always talked about marriage and even looked at rings together. When he ended things, he said that he knows deep down I’m the one he needs to be with but that he just can’t be with me right now. The same day he told me this, he started seeing someone else. She and I were acquaintances and they went to high school together. I found out through him posting her on his social media, knowing that I would see it. I gave the benefit of the doubt and thought maybe they were just friends catching up. He and I live a street apart and I see her car there. He continues to make it known on social media that he’s spending time with her. I have to wonder if this is personal to me, or if he’s trying to distract himself from grieving his mother’s passing. I know it’s not uncommon for SO’s to shut people out during a time like this, but I have to wonder if he is serious about her and was just appeasing me when he said we are supposed to be together. His mom and I were very similar so it’s possible being with me is a bad reminder of his loss. I just don’t know what to do because this is very hard for me to sit back and watch happen when we had such a deep relationship before. I am heartbroken from the loss of the woman who was my second mother, but just crushed by him moving on so quickly.