There is no length of time that is "too long". Sometimes even a year can go by and then you are with an ex and you can rekindle the same emotions that you used to have. Certains sights and smells and touches can bring that on.
Stop begging and go get laid....
four months
of course not.
If your ex became friendly two months after you two broke up maybe your ex wants to get back with you. Or Maybe he's trying to be your friend. Talk to him about it, if you want him back suggjest it.
Take a road trip and try to make things right.
Ask her to transfer to Your school? Or have a long-distant relationship? Sorry if this isn't much help.
Do, or do not, there is no try
Six months after leaving office.
This is a tough situation because your ex will be hesitant to commit to a relationship that will eventually turn long distance. The best thing you can do is to make the next two months fun and exciting. Don't force the relationship issue. Enjoy the time you have together and make every minute count.
ask her the quicker you find out the better
It depends on how much you cared about him... Sometimes it can take months.
Yes you can. But they obviously have to want you back as well. If the relationship ended bad the first time then a second try might not be a good idea. You just have to talk to your ex and find out if they still have feelings for you.