A partner’s privacy might be the grayest area subject in some relationships. It’s difficult to define boundaries around your privacy which is why they are always implied but not explicitly said. It might be difficult for you to communicate to your partner that they can’t use your phone, alone time, the necessity to know everything, the necessity to tell everything, etc. People don’t communicate these aspects to their partners and assume that things will go in their favor.
But due to lack of communication, relationships tend to break apart and cause significant resentment. Your privacy and personal space are the most important regardless if you are in a relationship or not. It is even more important to let your partner know that as well.
But what if your partner doesn’t respect your personal space and tries to invade your privacy? That might make you feel that your partner doesn’t trust you or lets you breathe. Eventually, you might feel suffocated and leave that person. But your partner needs to trust you, maybe they are just slightly more possessive.

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Regardless of whatever they are feeling, you should not be at the receiving end of getting hurt. The most important thing in such situations is to communicate rather than getting angry or overthinking that your partner doesn’t trust you or letting your partner carry on with such things. Communicating might seem like the most important thing currently but that will help both of you in self-reflecting on your actions and emotions. You might help your partner think about things they haven’t thought about earlier. It might be possible that your partner trusts you but had a bad experience which is why they end up invading your privacy. Let them know why these things make you feel bad rather than just stating that these things make them feel bad. Ask them the reasons behind their actions and think of ways to resolve this issue rather than just talking about it.
Relationships are a lot of fun but they require the most effort when it comes to maintaining a relationship. But if both people are on the same page, then it shouldn’t be too exhausting for you.