Boyfriend didn't invite me to his family's gathering?!

My boyfriends family had a gathering tonight. He never asked me to go with him, the reason I know about it because he said that his cousin was having a party and there would be food there. We were in each others presence for more than 2 hours. I came home, he goes to the party and I'm like damn, why didn't you ask me to go? He said I was busy doing other things. I said but all that time you never asked me to go with you. Why? He says again that I was busy doing other things. He pulled me to the side to have a conversation and still never mentioned going with him. I'm pissed because I don't get why he didn't invite me to go. Am I over reacting?
Boyfriend didn't invite me to his family's gathering?!
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