Inappropriate ex behaviour?

[LeFecker]

I am in a relationship with a man who has kids to his ex. I also have kids to my ex and we have a child together. Me and oh get on fine with my ex and his new girlfriend. My oh’s ex and I don’t get on at all.
So earlier this week I had a go at oh for being too friendly with his ex. (She has made our relationship very hard and still has feelings for him). I told him I don’t think he should be so friendly with her out of respect for me. Civil for the kids yes but no need to be doing her favours, hanging around at her house ages when picking the kids up etc
Fast forward a few days and my ex has randomly messaged me (we normally talk about the kids but that’s about it). The messages aren’t out and out inappropriate but they are messages which I wouldn’t want my oh sending his ex or vice versa. Also if I was my exs current girlfriend I’d be miffed too. It made me uncomfortable so just shut the conversation down nicely and I'm going to speak to him tomorrow. And my oh of course.
What i’m wondering though is, am I just being too uptight, have I overrreacted with my oh about how he communicates with his ex? I don’t think I am but would appreciate other peoples opinions.
man’s I’m sorry for the vagueness but I don’t want to give away too much.

What did he say????

for The sake of not causing A huge drama - just have a quiet word with your ex? Why cause a load of trouble when you don’t need to?

So is the issue that you received an inappropriate message from your ex? I am confused as to the relevance of you not getting along with your OH's ex

I think with this, as she probably know with having children from a different relationship, keeping that relationship amicable consistent friendly and stable is one of the highest priorities. That being said, your feelings do matter. You're in a relationship now with your partner and he's not with his ex and it is important that both of you communicate with each other to make sure that both of you are feeling respected and comfortable.
I think that you really need to consider where your tolerance lies with this and whether the issue is more a trust issue with yourself or whether they are crossing some boundaries. If you do feel they are crossing some boundaries then I would just speak to your partner about it and leave it in his court. The last thing you want to do is break down that cope parent relationship between the pair of them. The children will suffer with this. Your partner will end up stressed which will affect your relationship with him as well. That just isn't worth it.
Equally if you are having some trust issues then I would still speak to your partner about it and just make him aware and hopefully out of respect he will adapt how he has conversations with his ex. I think communication is key on this. If it was a matter that you felt your partner had feelings for his ex then I would have a completely different opinion.