We've been together for 12 years and have 2 kids together. He's a loving husband and father but over the years I've been increasingly uncomfortable with him keeping in touch with his ex (they were together for a year about a decade ago) . Every time he talks to her it triggers severe anxiety to the point I would feel physically sick. Eventually he started sneaking out of the house to take her calls. Although these are not very often, it's very obvious and I'm sure he's aware that I know given my reaction. Yet he continues to do it. It makes me feel like he priorities keeping in touch with her over me.
Is it unreasonable for me to draw a boundary asking that he not speak to her? We've had this company bversatuon before and he said he'd blocked her but that's clearly not true. I've tried reasoning with myself about it but I still can't stop feeling the way I do. It's probably due to some of the things he's told me about them when they were together that triggers me. How do I handle this?