Sorry if this is the wrong group to ask this
My partner and I (29M) are engaged and have been talking about having a open relationship, she (29 F) wants to have a fully open relationship with another boyfriend and for the first 5 years of our relationship we were monogamous, I've always been monogamous but i've never judged on how other people decide to handle their relationships, she says she loves me and wants to stay togeather and she just wants a second relationship but it hurts so bad, I feel like she doesn't want to be with me anymore or like i'm being replaced. We do love each other and want to find a way to make it all work.

My ask of you reddit, have any of you been in a similar situation and what steps did you take to make it work, i'm trying to open up to the idea, and I read some of the suggestions on another open nonmono page, I need to work on re creating my own self identity and not being so codependent but I might also want to try couples therapy to see if that can help me cope.

Again i'm trying to open up to this relationship style and am just trying to get some pointers and I guess validate my feelings on the matter, I don't know how to stop being jealous on the matter or how to cope with the pain of feeling like i'm not good enough.