My husband and I have been married for 25 years. We were each others first. We opened up our relationship looking for friends with benifits relationships. We have had a few experiences with other couples and singles and really enjoyed them. We started a friends with benifits relationship with one of his female friends. We both care for her and want to oficially have her as our girlfriend which she wants as well. We all get along really well and the sex is great. She has been staying with us multiple nights a week. For the most part everything is good except lately I have been feeling very jealous of their relationship. They were friends first and have a stronger connection than her and I do. I am starting to feel territorial and jealous. For example I ran to the store and she took a nap by herself in our bed. When I got home I felt like she had claimed our room as her own. Another example is they were in the other room laughing and I have felt excluded and like he would rather spend the time and have fun with her. This stuff doesn't always bother me but when it does it feels like a huge deal and over takes all my happy feelings and is happening more and more. My husband and I talk openly and he knows about how I am feeling and he really tries to support me. I really want this but am having a hard time going from just the 2 of us and having all his attention to adding a 3rd and sharing his attention. I guess I am just looking to see if anyone has been in the same situation as me and may be able to offer advise.