My boyfriend didn't even think about spending the 4th of July with me :[

I need advice...

So we've been dating for about 6 months. He's been working a lot lately so I haven't seen him as much as usual. I didn't see him this whole week. I figured we would spend the 4th of July together and I didn't say anything about it but I was talking to his friend who said they have plans to go out of state to a BBQ. I asked my boyfriend and he said "oh maybe I can see if you can come too." What the HELL? Why am I an afterthought? And then his friend told me there's no room in the car for me to come! I feel so sad I can't stop crying because I feel unwanted and I don't understand why my boyfriend wouldn't want to spend it with me or even think about making plans with me.

Please help. Guys, do you think this is normal? I feel like now I'm questioning our ENTIRE relationship. And I'm telling him I don't want to be in a relationship where I feel unwanted.
My boyfriend didn't even think about spending the 4th of July with me :[
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