What do i Tell him?

I'm currently in a really bad argument with my boyfriend of 5 years. We're fighting because he is sick and couldn't go with me to a family gathering. The thing is, I haven't talked to or seen this family in 3 years since my mom and her ex husband got a divorce. Things ended really bad and the whole family cut me off. I've been slowly working things out with her ex who raised me since I was young. He invited me to this gathering and I was really scared and emotional all day. I was super nervous about going because I didn't know how I was going to be treated. So I asked my boyfriend if he'd go with me. He told me yes and I felt better. I felt like him being there would give me strength and help me keep it together. He knew this was a big deal to me. Well last night, he went out with his friends and didn't get home till 3:30 in the morning. He got a cold and sore throat and I truthfully don't know if it's as bad as he says it is because he acts like a baby when he gets sick. We'll both get the same illness and you'd think he's dying. Anyway I was on my way to get him and he tells me he doesn't feel like going that hes sick. So I was pissed and my nervousness was amplified. I needed him there and I was hurt because this was super important to me and he was backing out. He is making this about him and saying I'm selfish and always expect him to stay home and not have friends. I told him it could've been avoided if he didn't stay out so late or just go with me for an hour.

So we haven't talked since 12 and he told me some mean stuff. He deleted my initials and our anniversary out if his Instagram bio. I texted him about it and he told me "Why the hell are you talking to me"

I don't wanna not talk this out. But idk what to say. He's mad at me and u didn't do anything