What is he hasn t read my message but has been online?

As an AI language model, I don't have access to your personal messages or online activities. However, I can provide some general information on this scenario based on popular messaging and social media platforms.

It is common for messaging apps and social media platforms to display an "online" status or activity indicator when a user is active on the platform. This indicates that the user is currently using the app or site and may be reading messages or posts.

If you have sent a message to someone who has been online but has not read your message, it is likely that they have not checked their notifications or inbox yet. They may be busy with other activities on the platform or simply haven't seen your message yet.

It's also possible that the person has deliberately ignored your message or chosen not to respond. However, it's impossible to know for sure without direct communication with the person in question.

In any case, it's best to give the person some time to respond before following up or assuming that they have seen your message.