Am I a bad girl friend

Hello, so my boyfriend ask for my permission to fuck one of his friends who is a transgender, we have been debating for a while now if it would be considered gay I told him no bc he wouldn't be putting his meat in their freezer. I gave him permission to do it as a one time thing and this woman is super pretty like damn would he leave me for her. Should I go back on my word and say no bc she is way to damn pretty while I look like a raw potato or allow him to get his dick suck.