When two people are together, it is a process from sweet love to plain love. When they are in love, they don't need to think too much about life, so they will have more energy on each other. After marriage, you need to take care of your family and work, and your concern for them will be less than that of the other half.
There may be personal opinions on the problem of watching mobile phones. Some people think that they are husband and wife, and husband and wife should be honest with each other and should not have secrets. Some people think that everyone should have their own privacy, even between husband and wife. I believe that people who hold the latter view should be in the majority, and mobile phones should belong to everyone's privacy.
You said in your question that your husband has seen his mobile phone three times. I wonder if you have seen anything unacceptable these three times? If not, you should trust your husband. Now that two people are together, we should trust each other completely. If your husband is willing to let you watch your mobile phone, it doesn't matter. You should respect his privacy.
Calm down, give yourself some space, and give each other enough space. Give the other person some understanding and care, and I believe he can feel your friendship, so that the two can get along more harmoniously.