It's difficult to determine the exact reason for your boyfriend keeping his ex's phone number under such a specific and affectionate name without more information. However, I can suggest some possible reasons for this behavior:
Sentimental attachment: Your boyfriend may have developed strong emotional ties with his ex during their relationship, and he might find it challenging to completely let go of those feelings. Keeping her contact with an endearing name could be a way to hold onto sentimental memories from that time.
Unresolved feelings: It's possible that your boyfriend hasn't entirely moved on from his past relationship. Keeping his ex's number under a special name might signify that he still has lingering feelings or hopes of getting back together someday.
Nostalgia and comfort: Sometimes, people maintain connections to their past because it feels familiar and provides comfort. He might not be actively pursuing anything with his ex but keeping the contact could be a way of seeking emotional security.
Avoiding detection: By using a vague or affectionate name, your boyfriend might be trying to keep his communication with his ex discreet. This could be because he's aware that you might not be comfortable with the extent of their communication.
Inertia: Sometimes, people simply don't change contact names in their phone even after a breakup. It might not necessarily indicate ongoing feelings or communication; it's just a habit he hasn't bothered to change.
Not over the breakup: It's possible that your boyfriend hasn't fully processed the end of his previous relationship and is still working through his emotions. Keeping her contact under a special name could be a manifestation of this.
It's essential to have open and honest communication with your boyfriend about your feelings and concerns. Talk to him about the contact name and how it makes you feel. It's essential to listen to his perspective as well and try to understand his reasons. Healthy relationships thrive on trust, communication, and understanding, so discussing your feelings can help both of you gain clarity and work through any potential issues.