My fiancée and I had a big blow out he just doesn't seem to understand my feelings when it comes to the ex

Last night my fiancée gets home from the gym and calls his ex so his son can talk to her. I understand if ss had asked to talk to his mom or if it had been awhile etc… but it's only been 2 days and he knows that the second he calls her she's back in our lives. Of course the call was only a few seconds long because he's only 8 and hates talking on the phone. But guess who calls 5 minutes later to talk to my fiancée…she wanted to have ss come down in March as well as during spring break in April. She knows this isn't going to happen because it's not possible, he'd miss school if he went down in March.

Than at 4 AM this morning my fiancée phone goes off, he got a text from his ex say "we need to talk." WTF! Why can't he just leave things alone? She's an adult she could have called ss on her own and is it really worth her starting up again so that ss could talk to her for a few seconds?

I know it's stupid, petty and immature on my end to be so pissed about this but every time she starts it just reminds me about how bad things were when she was in town. He was always jumping to do things for her even when I asked him not to and taking all her kids not just ss. She'd even call to ask him to pick-up bread on his way to pick-up ss or when he left with ss to take the garbage out…grrrrrrr!

I understand he did all this in order to get more time with ss because there wasn't any legal paperwork in place but it still bothered me and still does because it always felt like he was choosing her needs and wants over mine. I'm just not sure if I can get over all the hurt from before especially since he doesn't seem to feel it was a big deal. He just says "I did it for ss so I could spend time with him" I'm sure taking her oldest to a birthday party, taking the kids that aren't his to the dentist, picking up bread etc... was all for ss.

Is it really ever going to change? She's probably moving back to town in a few months and I'm scared that when she does we'll just be back at square one. Her needs and wants above mine.

You know you're losing it when you're actually wishing the ex would just fall off the edge of a cliff never to be heard from again