I (31M) have been with my girlfriend (29F) for almost 2 years and we live together. A few nights ago she was looking at our phone bill because we’ve been talking about combining some expenses and she noticed there was another line on my account. She asked who it was and I told her it was my ex. Obviously that did not go over well lol. For context me and my ex were together for 5 years and broke up about 3 years ago. We don’t hang out, we don’t talk regularly, there is nothing romantic going on whatsoever. When we broke up she was still on my family plan and honestly I just never took her off. She venmos me most months for it. Sometimes she forgets and I dont really chase her down because its like $40 and I make decent money. My girlfriend thinks the issue isn’t the money, its that I never told her and apparently my ex and I still having any kind of financial connection is “weird as hell.” She asked why after THREE YEARS I haven’t told my ex to get her own phone plan and I didnt really have a good answer besides… it just never seemed important enough to deal with? Here is where I probably made it worse. My girlfriend asked when the last time I actually talked to my ex was and I said probably months ago. She asked to see the texts and the last conversation was actually like 3 weeks ago. My ex sent me a picture of our old dog (she kept him after the breakup) because it was his birthday and we ended up texting back and forth for maybe 20 minutes. Nothing inappropriate at all, but I definitely remembered that conversation when my girlfriend asked and said “months” because I knew how it was going to look. So now she says THAT is the bigger problem because I technically lied to her face and she thinks if this was all so innocent I wouldnt have felt the need to lie. And yeah… fair. But she now wants me to remove my ex from the plan immediately and completely stop talking to her, including about the dog. I told her I’ll take her off the phone plan because clearly this arrangement has run its course, but I don’t think getting a random picture of a dog I raised for 5 years is some betrayal of our relationship. She says I’m being intentionally dense and that I would lose my mind if the situation was reversed. The annoying part is she’s probably right that I wouldn’t LOVE it if she secretly had her ex on her phone plan. But I also genuinely think I’d understand if there was a boring explanation behind it.