Am I wrong for feeling uncomfortable?

So I split with my eldest boys dad as soon as he was born.

We've been civil and we talk. Helps me out when I need something for him. He travels to get him during school holidays etc... so great relationship between us.

His family buys gifts for myother children with my new partner during Christmas etc.

So no bad spots at all in family layout.

The only issue I have is my boy meeting his girlfriends so soon.

In my boys lifetime (he's 6 soon) he's had a total of 8 girlfriends and as soon as he starts to date he introduces him to them.

I've asked politely not to - you know... give it a few months to see where the relationship is going.

I didn't think that was at all unfair. He thought it was.

Now he's with another girlfriend for a total of 3 months and she's getting my son to call her mum and that males me really uncomfortable. Again I voiced my concerns....wouldn't bother me if they are serious... expecting children together,married, moving in etc. I'm a very reasonable woman.

I just feel so funny about it. It kind of puts me on end and he's calling me over reactive and I need to get over myself.

Am I wrong with all of this?