I (40f) started seeing a my current partner (51m) about 4 months ago. He is new to ENM I expected it to be fun and sexy(it is), but I’ve grown to really love him as a person and feel like this can develop into something more down the line. I’ve been excited about the possibilities, but am enjoying the present as well. He started seeing another woman (37f) almost a month ago. I support him in that as I want him to explore this lifestyle and see if it’s for him. Also, she and I hit it off and it has very loose thrupple vibes (not super into the idea of an actual thrupple, but we get along and have all 3 been intimate together). The addition of her took a little adjustment, as I’ve been having him to myself, but that eased when. I met her. He said that this is it for him, he doesn’t want to add anyone to the mix because he’s content with what he has. Well, we’re talking the other day and he’s talking about his ex wife whom he’s been divorced from for 6 years. They have adult children together and as far as i know have had a friendly coparenting relationship. Apparently she’s been doing alot of self work, as has he over the years and he’s now wanting to explore a possible new connection with her. He’s made her aware of his current situation and is clear with her that he doesn’t want to change it. I appreciate his openness. But this is making me highly uncomfortable. That’s a huge addition and the history they have makes me feel like I’ll be phased out once they inevitably fall back in love. Maybe they won’t, but that’s where my head goes. Am I wrong for feeling insecure about this budding romance?