Asking for another invitation on top of the one you already received is generally considered rude, but if you have a close relationship with the couple getting married then it's an ask-at-your-own-risk situation. So, when a conflicted woman decided to consult the online courtroom of moral philosophy otherwise known as Reddit's "Am I the As*hole?" about her lack of a plus-one to a wedding, people were quick to help deem a verdict.
I am currently 42F as is platonic soulmate Betty. Now that weddings are happening here however with guest limitations the invites are coming in. I currently have an issue with a friend of mine who has opted to extend a plus one to another friend Lora, who has only been with her boyfriend for <6 months but not to myself so I can bring Betty who I've been living with for the last 18 years.