Could my boyfriend still have unresolved feelings for his ex?

they broke up six months before we met. they were together for three years. he told me he doesn't talk to her anymore, but lately they have been texting frequently. he even hung up on me a few days ago to answer her call, and last night he asked me if she can hang out with us.

they broke up because she cheated on him, and she's still with that guy. but he still says things like "she's with the guy that took her away from me." he also talks a lot about how he regrets how he treated her when they were together. it just feels like there's some unresolved feelings. when i brought it up to my boyfriend he said i must be projecting. he swears he doesn't like her. i told him he can't control how he feels, and if he has feelings for her still, just tell me. he got upset and doubled down. maybe i'm overthinking it but something about this is bothering me.

Could my boyfriend still have unresolved feelings for his ex?
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