Ex partner introduced our son to a “friend he’s taking things slow with”

[Pinkie89]

Ex partner introduced our son (7) to a “friend he’s taking things slow with”.
AIBU to think this is abnormal and concerning? Honestly I’m so angry and he’s completely betrayed my trust. I asked him out right who this girl was 2 weeks ago after my son mentioned her and whether it was someone he was dating and he said no it’s a friend, a few days later he’s posting her on Instagram and evidently she’s not just a friend.
I don’t think he’s known her long, they spent the last 2 Saturdays together, with my son. In my eyes that is not taking it slow and he shouldn’t be introducing him to people he’s know 5 mins! He’s done this once before and it ended within a month and my son is still upset he doesn’t get to see her dogs… 2 years later! Now he’s excited about this ones cats! My mum introduced me to lots of men which really wasn’t nice so I don’t know if this is clouding my judgement? But I would never introduce him to someone I was “taking it slow with”.

At that age my DC cried and was upset for months over leaving a dog they met on holiday - I really think you're reading too much into that. Why shouldn't adults have different friends that they see more or less of over time? As long as they are not being overtly sexual in front of him I do not get this Mumsnet obsession with ex's new partners meeting shared children.

If he’s already introducing his child to her, he’s not ‘taking things slow’. My (adult) children don’t see their dad now because they got sick of having to share him with new girlfriends.

You're right to be wary of this.. its not fair to any child to introduce them to someone who may not be a permanent part of a parents life .. its confusing and they do remember my son said this about his dad.
It gives a bad impression .