Whether something is considered "normal" can vary depending on cultural norms and individual relationship dynamics. However, in a committed and healthy relationship, transparency and open communication are generally key components for trust and security.
Having contacts in one's phone that a partner doesn't know about, especially of the opposite sex, can indeed be a cause for concern for some people. It may raise questions about transparency and trust within the relationship. While it's not necessarily wrong to have friends of the opposite sex or to have their numbers saved, the way in which these friendships are maintained matters.
If someone is intentionally keeping these contacts or friendships secret from their partner, it can be seen as sneaky behavior and might lead to feelings of insecurity and mistrust in the relationship. It's essential for both partners to feel comfortable discussing their friendships and being open about any potential concerns they may have.
The key is open communication and setting boundaries that both partners are comfortable with. If you feel uneasy about something in your relationship, it's important to talk to your partner about it and express your feelings. Honest conversations can help address any misunderstandings, clarify intentions, and ensure both partners are on the same page.
Remember, every relationship is unique, and what may work for one couple might not work for another. The most important aspect is that both partners feel valued, respected, and trust each other.