I have met many men like this, who are uncaring cowards when it comes to breaking up. Yes, it sucks, but you cannot control other people's behavior. I hope you meet a better man in the future.
Can you check with his work place that he got to work on Monday?Is it possible to make enquiries with your local police deptartment?
While there are men that break up with women like this, its also a concern that you simply haven't heard from him or seen any sign that he's been home at all!
There are two things going on here - the first is to establish that he is alive and OK. And if he's alive and OK that pretty much establishes the second part - that he's breaking up with you by avoiding you.
If he is fine and OK, then I wouldn't get into a big conversation with him. If he hasn't got a fantastically good explanation, his lack of communication has been cruel, unneccessary and hurtful. There would be no point in talking further with him or getting into any discussion. Especially do not ask questions like "Has he gotten back with the ex?" or "Why don't you like me anymore?". They are pointless and pathetic. I would also stop any and all txt now. Clearly they are not working and useless at this stage.
If he isn't fine, then thats a good reason for not contacting you.
I don't think that I could stop trying to find him or contacting him until I knew that he was safe and sound even if that meant he had been breaking up with me by avoiding contact.
This is strange...if he was excited to see you and he hasn't been at home...maybe something continued to happen with his mother at the last minute and he was unable to return home.
Stop trying to reach him and see what happens.