Save the dates

I addressed them to the couple since both of them were the ones invited, even if they didn't live together (I just sent it to the person I was closest to). I don't know if that's exactly proper etiquette, but whatever lol 🤷‍♀️.

I addressed it to both of them

I would also address to both

I think I only invited married couples or single friends. I don’t really have any friends who fit what you’re talking about. Well except a cousin or two, but for them I just sent one to my Aunt & Uncle & Family.

If they’re a couple, both should be addressed. If you’re giving an “and guest” obviously that’s different.

Save the dates are very informal. Address them by name to each person specifically on your list to avoid confusion. If you are inviting the entire family rather than just a couple, then say Matt & Daisy and Family.

The proper way to address a couple is:

Mr. John Smith & Ms. Jane Doe

123 Never Send Ave

Nowhere, Fl

Even if they don't live together. The first person on the address line should be whoever you're closest to and the ampersand indicates the couple status. If you are sending the invitation to people who are roommates but are not a couple the names go on sperate lines. (This also applies to children):

Mr. John Smith

Mr. Jake Adams

For Children:

Mr. John Smith & Ms. Jane Doe

Miss Abigail Smith

Hope That helps!

ALSO:

Lesbian Couples who are married and share the same last name:

Mesdames Juliet & Mariah Carpenter

Gay men who are married:

Messrs John & Jake Adams

Definitely to both. Etiquette-wise, any couple should be addressed to both people, regardless of how long they've been together, because it isn't your place to decide the serious-ness of their relationship.

Address them both if they are both invited.