Boyfriend invites girl best friend to spend night?

So my now ex since I broke up with him, invited his best friend which is a girl to spend the weekend at his place. I didn’t even know, he called me at work told me a friend was coming and I was chill about it weeks ago. Then a few weeks pass he says his friend is coming, I say which friend he says a girl. I still don’t care she’s coming, I say where is she staying he says his place. We have had a serious relationship for awhile. He didn’t intend on introducing her to me nor telling me she was coming and staying at his place. I felt disrespected. He made me feel horrible for my feelings of uncomfortableness of her staying at his place, and made me feel like a terrible person. I broke up with him today. I felt it wasn’t okay. Since she didn’t have a boyfriend and knew he had a girlfriend, I didn’t care that they had been friends for awhile he should have told me. He said he wasn’t going to tell me because it didn’t matter. He apologized in the end but it was too late. Was it wrong of me to break up with him or was I right because I didn’t feel he was being truthfully honest with me as to which friend was coming and hid it. I wasn’t invited either to meet this so called friend…
Boyfriend invites girl best friend to spend night?
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