Me and my boyfriend have been together for about 6 years, we've talked about having another person in our relationship (always with a she pronoun). Today I brought up a guy that wanted to take me on a date, and asked him if he was okay with it, all I got was a "well if you want to". I do want to see this new guy but don't want to upset my partner either. What do you think I should do?
It sounds like it’s just you who would be dating this new guy. That means that the third person is not “in your relationship.” There is a new relationship that would form. This is generally called V-shaped or “Vee” polyamory. It’s important to have the right language for what you’re feeling and doing, because that can help you frame it in an accurate way, approach it without assumptions or misunderstandings, and point you to helpful resources.
Polyamory requires open and honest communication. “Well, if you want to” does not qualify. You need to talk to your boyfriend about his best-case and worst-case scenario, as well as yours. What do you want out of this? How do you feel? How does he feel? What might change between you two? What are dealbreakers for each of you? What questions do both of you have?
If he’s not willing or able to have this kind of conversation, then he’s probably not someone able to be in a healthy polyamorous or open relationship.