Ex emailed me and then stopped responding??

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My ex and I have been broken up for a while now (probably 2 years?)... anyway, I received an email from him out of the blue in May (I'm guessing after he broke up with his girlfriend) and we have been emailing each other regularly since then. However, it's been 3 weeks and he hasn't responded to my last email, which I find very strange since everything was going fine. I was hoping you lovely LS folks could help me figure out why...

 

Some important points:

 

• We live in different countries. I told him I'd be going to his country soon and he sounded like he wanted to meet up with me.
  
• He moved to a different city almost 4 weeks ago and started uni there this month. He says he doesn't know anyone there.
  
• In his last email, he said he'd send me pics of his new apartment and that he's almost finished. He said I have to send him some pics of me. I said I'd send some when I get pics from him and asked him when exactly he'll be starting uni.
  
• I've asked him several times when he'll start uni and he keeps dodging the question. He tells me the month but avoids telling me the date or ignores the question when I ask for the exact date.
  
• I have been in contact with one of his friends (not a very good friend of his) and have been friendly towards him in emails.
  
• I have no intentions of getting involved with my ex romantically. I was just hoping that we could meet up as friends. However, he told me in the past that he could never be friends with me... although I think enough time has gone by now.
  

 

Reasons I've come up with:

 

• He met someone else. I think it's highly unlikely that he'd meet someone new so soon, given his personality (lacks self confidence, shy, passive). Also, it's unlikely that he'd be involved with someone he already knows in the new city, because if that were the case, then he wouldn't have contacted me months ago.
  
• Is back with his ex or his ex contacted him. That could be the case, but I think they live in different cities. (Perhaps I'm wrong in guessing that they broke up?) Also, if I'm right in guessing who she is, I am better looking and more successful than she is.
  
• Lied about starting uni since he avoids telling me the exact start date (he has lied about trivial things in the past, but this lie would be quite a big one). He might do this to convey to me that he's doing something with his life now.
  
• Sees further contact and meeting up with me pointless, because he'll just get hurt again when I leave (especially if he's been lying). Also, not to sound arrogant, but I am much more successful than he is, so perhaps he thinks we're not on the same level and he has no chance, thus getting hurt again if we meet up?
  
• His friend might have forwarded my emails to him or told him about my emails to show my friendliness and that I can't be trusted. I don't think he would do this, because his friend has addressed me in his emails as "honey" and also basically told me that my ex wasn't doing anything with his life. However, his friend is moving apartments in November and also said that he'd send me pics of his new apartment, so perhaps they're up to something?
  
• Isn't finished getting things done for his new apartment. I doubt this is this case since it's been almost 4 weeks since he's moved in and he also emailed me after he moved in, which means his internet and phone connections have already been set up.
  
• Sent me an email with photos of his new apartment but the email wasn't sent successfully. I doubt this would occur, as he would have needed to have attached heaps of large photos and would have also been notified if the email wasn't sent successfully.
  

 

In the meantime, I've set it up so that his emails will automatically go into my archived folder, skipping my inbox. I will probably check my archived folder in several months or completely forget about it.

 

However, I'm interested to know why he hasn't responded. So, what do you guys reckon? I would be very grateful if someone else could provide some insight. Thank you all in advance!