Where has my libido gone?

It's like it's disappeared. haha :/ It has always been very very very high and I just don't why all of a sudden it's just nonexistent. I was in a relationship that I ended a few days ago and when we were together we had sex everyday. Multiple times. We were trying to conceive which is when it started to decrease. Our relationship ended kind of ugly and maybe it's a mental block that has me this way. I'm not looking to have sex for a long while and I guess this should be a happy thing but I just want to know what could be the reason for this. What usually decreases a young, healthy persons libido?