Doesn't mean anything, my first serious relationship the guy told me it wasn't another girl and then a week later he was all over another girl. But honestly could be a ton of reasons.. maybe he still cares about you and isn't able to deal with the distance or the break up so well.. a lot of guys tend to try to completely cut themselves off from complicated situations.. they feel it will be easier to just avoid it all together.. My best advice is to just Let him be and not hold a grudge. You broke up for a reason, whether you still care about each other or not, you broke up.. Either bad timing in life to be together, not right for each other, whatever it was for a reason, try to enjoy the time being single.. If you are meant to be it will happen when the time is right and if not then you will eventually be grateful it happened this way and will learn a big lesson about yourself and what you really want in a relationship.