lieuz
Chumono
I hate to agree with @rockm but I too had a chinese elm that looked VERY suspiciously like this one in color and everything else (it ended up dying, spring came and no leaves. waited another 3 months into summer and no leaves). I forgot what had happen to mine but I do recall it being outside, my elm never came indoors, and one very bad winter, it never recovered. I don't recall repotting mine but I think there were times when we had unseasonably cold cold nights and it went on for possibly a week or 2 and that may have did it in. But in your case repotting it may have really done it in. Here is what mine looked like when I was praying it would bud and leaf.
Taken around May of 2010.
Taken around May of 2010.