I feel like a lack of communication partnered with no time for each other sounds like trouble. You should always talk to each other. It's better to ask your partner if something is bothering you rather than making up your own conclusions in your head.
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I think being evasive, hiding their phones while they're texting, taking phone calls away from you, changing their routines, that sort of thing.
Common signs are frequent changes in phone passcodes as well as passwords in social media platforms.