Wow guys, thanks for everyone´s input - I think you literally saved my a## with this one!
So gf sent this message to me today:
"Hi Love! It´s been such a lovely day - nice work, long phone conversations with (two female friends) and now glass of sparkling with a good book at my terrace:) Got also invitation to have another glass with (neighbors name) and the kids this evening. We talked with my friends about some fears of mine that have came through from past in our relationship. It was very helpful, since now I feel more self love and more ready to be yet more open to myself and you. You are in my heart, love you (heart)"
I had such strong emotions earlier around this "friendly neighbor"-topic that having had this message before your comments I most likely would have reacted from the place of insecurity. Maybe I would have answered something along the lines of "it doesn`t feel good that you visit your neighbors house without your daughter" etc.
Now I simply replied that "It´s great to hear that you had such a good day! I´m interested in hearing more of your findings when we meet (we have a date tomorrow) to be able to understand you a little better and deeper again. Have a great summer night, enjoy love!"
It still doesn´t feel like a good idea that she has a drink at his place, but my anxiety levels have dropped substantially them being now around 2 out of 10 while they were like 8 out of 10 before I got support from you grounded guys.
We both have committed to exclusivity and I don´t have any reason to doubt her trustworthy. But my plan is now to try to meet this guy in the near future to sense check his energy.
Yet again, thanks for your comments and if you have any further notices I´m happy to hear them:)