feeling sad

so I had a chemical a couple of months ago and we’re going to go to one of his family members gender reveal. I want to be supportive and go! I already said I would. My question is HOW do I go and compose myself with the same people who NEVER checked in on me… not one time did any of them ask. In fact, the person having the gender reveal told me my boyfriend wasn’t ready to be a dad the day I found out. So needless to say, Im not ready.