What is he talks to me then ignores me?

If someone talks to you and then ignores you, it could indicate a few different things. Here are some possibilities:

1. They might be shy or introverted and feel awkward about continuing the conversation. Talking to you initially might have taken a lot of effort, and now they don't know what to say next.

2. They might have other things on their mind that are distracting them from the conversation. It could be something as simple as a notification on their phone, or something more serious that they're worrying about.

3. They might not be interested in continuing the conversation with you. They might have just been being polite or trying to pass the time, and now they're ready to move on.

4. They might not know how to end the conversation gracefully, so they're just letting it fizzle out.

If this happens to you regularly with the same person, it might be worth having a conversation with them to try to figure out why it's happening. It might just be a communication issue that can be resolved with some honesty and effort.