any suggestions???

Shortly after my SO started his job, he had a family emergency. He was apparently crying at work, had to leave work, too upset to drive, etc. Before he ever called me or asked for my support, he confided in his overly friendly female boss. Crying to her and discussing his feelings. They were texting about these very personal issues for weeks. I saw a few things that I suspected as flirtation. 😒 He tried to introduce me to his coworkers and RIGHT in front of me, she asked about his personal/family issues. I instantly got pissed and walked away. How could he confide in her over me? He wouldn't even discuss his feelings with me. We had just lost our baby a month before... I confronted him and said it bothered me that he would cross boundaries and share his personal life with her especially when he wouldn't open up to me. He was so defensive and said no matter how I felt he would sill discuss personal matters with her. I am now pregnant with our son. And I just found out she said "wow I don't think she likes me" to him also???? I also recently went into his work to get something and she didn't say a WORD to me? Completely turned her nose up to me and all. Ignored me. Am I just overreacting or is it an issue that he 1 confided in another female over me and 2 didn't put her in her place when she made a comment about me?? I feel so betrayed and hurt still that he would ever confide in ANYONE over me especially another woman. What should I do?