why did i stop receiving texts on my computer?

If you are forwarding text messages from your phone, on the iPhone, go to [Settings > Messages > Text Message Forwarding] here, make sure that it lists your mac (the toggle switch is on or green). If not, turn it on and enter the code on your mac on the phone.

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If you are talking about not receiving iMessage on your mac, open messages and press [⌘(command) + ,] and go to accounts tab. Make sure that this bar shows your apple ID and the message emails and numbers. LIKE THIS: https://www.flickr.com/photos/121340273@N04/16835123442/

Yes, thats fine, it's basically saying that iMessage was rebooted on your iPhone. (Just a safety thing). Please identify your problem. Is it: 1. iMessage not showing up. or 2. Text message forwarding not working.

If you are forwarding text messages from your phone, on the iPhone, go to [Settings > Messages > Text Message Forwarding] here, make sure that it lists your mac (the toggle switch is on or green). If not, turn it on and enter the code on your mac on the phone.

Oh, and btw, an iMessage has blue texts bubbles, but texts (sms) has green bubbles.

Who knows?

Did you make any changes recently? Did you change some iCloud settings? You've given us nothing to go on.

Then, you weren't forwarding. If you could remember, before it stopped working, were the message bubbles blue? Did you send messages to emails?