I just realised something really important.
One part of getting over jealousy is admitting that you're wrong and saying that you're sorry.
Even if that's not accepted, you realised it, and you acknowledged it. No one likes jealousy, and least of all when you're the one tha harbours it. It eats away at your insides and you feel horrible about it. And crying over it releases a little of its power over you and puts you in the right frame of mind to start to heal it.