To know if someone has deleted you from their contact list, there are a few methods you can try. While there is no foolproof way to determine this, these methods can provide some clues:

1. Send them a message: One way to check if someone has deleted your contact is by sending them a message. If they ask "who is this?" or if they ignore your message, it could indicate that they have deleted your contact information [1].

2. Check their WhatsApp profile: If you are connected with the person on WhatsApp, you can check their profile to see if they have deleted your number. If their profile picture is no longer visible or if it has been replaced by a blank white avatar, it may suggest that they have deleted your number from their contacts [2].

3. Observe their last seen status: On WhatsApp, you can also check the last seen status of the person in question. If you are no longer able to see their last seen status or if it is not updating, it could indicate that they have deleted your number from their contact list [2].

4. Monitor their WhatsApp status: Another way to determine if someone has deleted you from their contact list on WhatsApp is by checking their status updates. If you are unable to see their status updates or if they no longer appear in your list of contacts who have posted a status, it may suggest that they have deleted your number [3].

It's important to note that these methods are not definitive proof that someone has deleted you from their contact list. There could be other reasons for the observed behavior, such as changes in privacy settings or technical issues. The best way to know for sure is to have a direct conversation with the person and ask them about it.

Learn more:

1. How to check if someone has deleted my number from ... - Quora
2. How Can I Tell if Someone Deletes Me From Their Contacts on WhatsApp? | by Vocal How To | Vocal logs | Medium
3. How to Know If Someone Deleted Your Number on WhatsApp Exactly