My bf and I opened our relationship up in October. It's been difficult for me to get comfortable with the idea of him with other women. I have some deep down fears that he's going to replace me, and it sucks. I've made progress, but I'm finding it difficult to be supportive. I seem to land at neutral at best when he's telling me about potential new partners. It's taking the joy out of it for him, to the point that he's wanting to reevaluate being open/the relationship in general.

I like the idea of ENM, but putting it into practice has been far more difficult than I imagined. How long is "reasonable" to adjust to this new way of being, and more importantly does anyone have any suggestions for how to cultivate compersion?