What do I do if I feel like my boyfriend is growing apart from me?

it all started when we got back together after we broke up, we promised we’d be more open and understanding to each other because us keeping our struggles a secret and being stubborn and naive led to us breaking up. now i feel like he’s so distant and growing apart from me the past week, he’s not his usual self and i think there's another girl… I don't know what to do atp
What do I do if I feel like my boyfriend is growing apart from me?
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