Hello Cate,
Maybe by changing your perspective towards love might make you feel better. Somehow we have to admit that, dating someone else is a bet in our life, either he or she will be ideal partner or a bad partner. A bad partner will bring more harm than happiness, just like what you have mentioned; depression.
Obviously, you’re dating a bad partner. This phase of your life will be the time for you to learn “how to let go”. It’s part of our journey, everyone does. You’re not alone.
Take this lesson as positive force for you to have more visibility in relationship and now you know what makes a ideal partner.
The next relationship, you must have some prerequisite for it; honest, kind, gentlemen and etc. I know what I am trying to say 🙂
Cheers,
George