<human>: Could you distill the essence of the text into 1-3 sentences?

One thing I want to be clear about: I absolutely do not want to be selfish here, I just have not dealt with this situation before and am totally willing to be told it is not appropriate.

My cousin is getting married later this fall. When we were younger, we used to be really close, but as we got older, family functions became more separated and we saw each other less often. We are still friends on facebook and the like. 

My family just received the save the date for his wedding later this year, not an official invitation. I am genuinely happy for him and delighted to celebrate this occasion. Now the question.

I have a long term boyfriend that I have been dating for a year now and have known generally for two. We are planning on moving in together this summer. I do not think my cousin is aware, nor do I think his family thinks of me as separate from my parents, necessarily. I would love to start integrating my boyfriend into family gatherings, as I do see a future with him. Is it appropriate to ask my cousin what the general policy on +1s is, or should I just wait for my parents to get the official invitation? I definitely get that this is his day and is no way obligated, but if +1s are allowed he will not know I am in a serious relationship unless I tell him. Insight would be appreciated.
<bot>: Cousin and I used to be close, drifted apart as we got older. Can I ask him about the +1 policy for his wedding, or is that intrusive and disrespectful?