I've got a friend who I met at a baby class a year or so ago and who we've since had lots of meet ups and family play dates. They are always fun- with wine and nibbles whilst the kids play.
Last year I had a Christmas party where I invited this friend and her DH and kids and some other friends, none of whom she knew. One of the friends I invited is a new friend- I had only met up with her a couple of times. Let's call her friend 2.
Fast forward a couple of weeks and I met up with friend 2 in the park who had been at the party and usual chit chat what are you doing at the weekend etc and she goes "oh we are meeting up with [friend 1] tomorrow actually". I was surprised but let it go but since then it seems these two women have met up multiple times (I know this because friend 1 often now refers to friend 2 when I see her). There has been one evening where we all went out together but other than that we see friend 1 and her family on our own and we haven't been invited to mutual meet ups all together.
I've asked friend 1 what she is doing this weekend and she says oh friend 2 is coming over- you can join us if you want. I've accepted the invite.
Is it normal to feel a bit jealous/put out by this relationship when I was the one who introduced them and since then their friendship has suddenly developed and I'm sort of the third friend somehow! I still see friend 1 but I feel like she's sort of shown me her true colours by sort of going behind my back with my other woman. She didn't text me and say "oh I really got on with friend 2 at the party I'm going to drop her a message" or "shall we organise a drink all together?" She's just sort of gone off and started this friendship without ever acknowledging me.
I suspect I'm probably massively overthinking and I do actually have some issues with low self esteem in friendships but is it normal to feel a bit hurt? I think it's tapping into one of my fears about friendships which is that people will lose interest in me if I introduce them to other people.