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.
In reading the scriptures, there are two kinds of mistakes:
One mistake is to cling to the literal text and miss the inner principles.
The second mistake is to recognize the principles but not apply them to your own mind, so that you waste time and just make them into causes of entanglement.