Boyfriend confessed something to me last night during a party/event about his ex girlfriend. what do I do?

Anonymous

Last night me and my boyfriend went to an event where we were all dressed up and cute, the night was just fine and me and him have had a strong happy relationship and I know he wouldn't do anything wrong behind my back at least that I'm aware of, as the night went on it turns out his ex-girlfriend was there, and she started this whole drama which ruined our whole entire night. He later on sat me down during the event and told me when we were talking that he had tried to make himself seem like a dick for just "wanting her for sex" so she would block him and leave him alone. I started questioning him and getting a little more suspicious and upset, when we finally got home, he told me that one night his ex-called him on the phone around 11pm and told me she was doing sexual stuff on the phone, and he didn't know if he had a little bit of interest in it but didn't do anything apparently. This happened on May 3rd we got together on May 10th, and we have been talking for 3 months or 4. He told me he didn't know better and that he didn't notice how much of a great girl I was and that he didn't think any of the bullshit he did that week before we got together. I'm a little upset because around that whole time he was telling me I was the only girl he was remotely interested in and I trusted him with everything, he isn't doing anything now, but he JUST decided to tell me this because I found out during this event.

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Is it wrong for me to be upset since we weren't dating until 7 days later but were committed while talking and waiting for the right time to get with one another?
Boyfriend confessed something to me last night during a party/event about his ex girlfriend. what do I do?
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