Thinking about having a threesome

So me and my boyfriend have been talking about having a threesome for some time now and I was thinking about going through with it in April on my birthday. It wasn’t going to be with a girl we know I wanted to get like a stripper or private escort to do it with us. I was wondering for women who have done it did your relationship change between you and your partner? I know everyone is different but I just need some insight on the aftermath of doing it. Thanks!