If something like that happened to me, I wouldn't look for only Buddhist tools, but anything that worked, especially if my daily practice was disrupted.
Here are some ideas to get over an ex more quickly:
- stay busy, preferably with something absorbing. One day you will look up from your work and you will realize you feel okay.
- spend a lot of time with friend who really like you and who you really like. Have fun in addition to venting to them.
- start dating
- go for counseling
- get in really good shape or do some kind of self improvement where you can see incremental results.