How do you know if someone has agoraphobia?

How do you know if someone has agoraphobia? My friend lately hasn’t been wanting to hang out with me outside, he always wants to stay home and do things inside. I invite him places but he never wants to go. He has left school too without even getting his diploma and just stays on the computer all day. It’s been almost a year like this. I am worried about him. Does this mean he has agoraphobia? If so why and how can I help him?

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