Boyfriend didn't tell me his ex was texting him?

Anonymous
I found out about a week ago that my boyfriend's ex (from 2 years ago) has started texting him, trying to get him to talk to her again. I found out at 1am when he got a text and he said, "ugh is this my ex?" and I saw not one, but multiple texts from the past 4 months.

No, he never responded to any of them. But he never told me either, claiming it would just upset me, which is true. However, it upsets me to think that he was basically hiding the fact that this crazed girl has been texting him every month.

What's worse is she is like 4 years younger than us and cheated on him for a total of over 7 months when they were dating. I've asked him to block her number since it appears she just won't stop (and she is still dating the guy she cheated on him with) and he says he will block her, but then claimed there was no way to do it unless he called the company.

I've sort of lost trust in him. Like any time an ex texts me, I let him know instantly. I think it's only fair, otherwise it's hiding it, but none of my ex's have texted me at least once a month trying to be bff's again. (more like once a year or less)

So I'm at a loss. He tells me I have no right to be upset or pissed off, but I feel betrayed. I told him it's good he ignored those texts, but why didn't he tell me? I have little trust in people because of what has happened to me in the past, and he knows my trust can be damaged by something like this :/
Boyfriend didn't tell me his ex was texting him?
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