For me, polyamory was like the key to a lock I didn't know I had. It was the acceptance that it's okay for my life partner to not fill all of me needs. It was the acceptance that I wasn't a bad person for still crushing on people. And strangely, it has allowed me to open to make new friends and tell old friends how I really feel. When I as trying my damnedest to be the best mono person I could be (I don't do anything by half measures), I was afraid to make new friends because I was afraid I might want something more than friendship and I thought that part of my life was over when I got married. I didn't realize that was what I was doing, but now I see it.
It's only been a few months since I've come to this realization and have been on a grand total of one date, but I feel like I came alive when I accepted who I was. I felt the same way when I accepted I was bisexual.