@eelousia
Sorry I sent above off-subject message! I'm back now - change of plans, and can devote my thoughts to your sad situation.
I am truly sorry you have had this happen. It's a horrible experience and takes a very tough person to get through it without feeling very hurt. I really do think it's them and not you. I also think that the texting girl has caused the problem and you were right to set her straight.
I would look at all the help given here and think which is most likely to work for you. I tend to think that trying to keep going and planning as full a life as you can is a healthy way forward. Going to groups where young mums meet, joining a gym or exercise class, book group, just doing whatever you can to get out and be with people even if you don't particularly know them. Was there anyone in the group with whom you did get on more than the others? Could you invite her round for coffee or ask to meet up somewhere just for a social chat? Just set the ball rolling, you may not want to put her on the spot and say were they avoiding you. Or you could say it as a joke, something like "I haven't seen everyone for so long I thought you were all avoiding me! chuckle chuckle". If the conversation goes well you might be able to say you told flirty girl to stop texting your partner. But be kind to her, don't put too much of your distress on her. I would like to think you could meet one or two of the nicer members of the group starting with a short session say, for a coffee.
It certainly may be true that flirty girl has blackened your name to the others. I think this could have happened to me. A woman friend of mine was ill and I helped her out. When she was better, I was at her house, waiting for her to get ready to go out, I was driving. Her husband came into the room and I said it must have been hard for him when his wife was ill. To my surprise he hugged me. It was a completely friendly hug which he did, not I. However I think she might have seen and as she is very jealous, since then I have heard nothing at all from her or the group with whom I usually met her. However, I don't think they all see me as a husband-snatcher as I met one of them and she was very kind and friendly. In your case, surely they are sensible enough to have their own opinions after knowing you for 18 years? I wonder if they have just drifted away without any bad reason, but just haven't been organised in arranging meetings. Maybe you could try and meet up with some of them just to see what the reaction is? If you sense they are avoiding you, then ask them outright if this is so and why. You were confident and wise enough to tell the flirty girl what she was doing wrong, so use this confidence to ask whether they are avoiding you. I would make this approach kindly and gently in case there is nothing bad going on. It would be a pity to put their backs up if they just thought you were busy with your baby and couldn't join them at the moment.
Whatever you find, remember that life always brings changes, some of which are unwelcome and not what we expect. Go with the flow and keep making a good life for yourself. Be friendly with people you meet and, as I said, try out new things which will give you the opportunity to widen the circle of people you meet. If you don't meet anyone for a while, don't let it bother you. I found that I made a lot of friends through my children, by meeting them at the groups where we went when they were little, or later at the school gate. Other friends I met when studying and through my interests which are writing and singing and music.
I wish you every bit of good luck. Don't lose confidence in yourself. Things will improve. I believe you will make friends through meeting people when you are out with your adorable baby.
Don't lose heart! Keep saying "so" ? (for introductory effect it works - I learned on one of my many creative writing courses!) Thanks for coming to us oldies, it's so encouraging to think a young mum values our experience.
With lots of love
Elle x