Am I important to my boyfriend?

My boyfriend and I have been dating for 3 years. Lately he has been weird about things between us.

His family is going to Argentina for a week during school therefore he would have to miss a week of lectures. He would never skip ONE lecture to visit me...

He would rather go to his cousins house for his cousins birthday rather than spend time with me on my champagne birthday party.

Always forgets to text me or make time to even see me

Am I important to him or am I over exaggerating?
Am I important to my boyfriend?
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