Is it bad that my boyfriend is visiting his cousin without me?

So I asked him if he wanted me to come to visit his cousin. He said he'd just go on ahead and go by himself. I'm like ok then, but my mom was like "why didn't he invite you". I didn't really see a problem. I asked could I come, he said I could but I guess he'll just go by himself.

Is it bad that my boyfriend is visiting his cousin without me?
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