To cut a long story short my current DP suffers with severe jealousy. I have 1DS with my ex partner. I also have 1DS with my DP. My ex and I co parent amicably for the most part how ever my DP finds issue with every single plan I make with my ex. He seems to only be happy if we are arguing. He hates me messaging my ex about anything. We rarely speak as my DP is very full on about it. Any communication I have with my ex, my DP wants every tiny detail. Now here's my issue. I know my DP is still in contact with his ex wife. They share no children. He said they rarely speak but I've had a feeling that isn't true. Today I asked for the first time to see his messages, he panicked, showed me a few but then snatched his phone and didn't want me to see anymore. It turns out they message every single day...about everything. I have absolutely lost it over this simply because of the amount of stress he causes me about communication with my ex about our DS. I feel like this is hugely hypocritical and want to know if I'm being reasonable to end it over this. We have a string of issues but this feels like the icing on the cake right now.