You don't know how lucky you are to be rid of this jerk.He sounds like a totally wothless piece of sh-t.Scrape him off your shoe right now!
You also don't know how lucky you are to be young(you sound young),,and in good physical health.You probably have a lot of things going for you that other people do not have.
Take a shower,fix yourself up,go out with friends,or go shopping.Call a therapist at a clinic,go talk to someone,join group therapy.Get a volunteer job helping people in worse straights than you.There's a lot you can do to help yourself.
"I don't understand how someone I love so much could be so mean and cruel." Sweetie, it's because he does not love you as much as you love him; and no matter how much you love him, he will always be a major jerk! You deserve someone who loves you as much as you do them and anyone who tells you to go kill yourself is an awful person and not worth your time! This is emotional abuse, you need to get away from him, he is not worth it. I know it is not easy to leave someone you love and care for, but he sounds like someone who could become violent, if he hasn't already. Please talk to someone who can help you help yourself. You do not need to put up with this kind of ****!
You will get over the pain, especially from someone that nasty, you are worth more then that "love".
I believe what other people say and do is a direct reflection of their own reality and you should not take it personally. This can be hard to do especially if somewhere deep inside you believe or want to believe what is being said. Some people only know how to express their "feelings" in a negative way such as being mean and cruel. They are usually scared and are protecting themselves emotionally.
I am sure that you do love him. But it sounds like it might be a "co-dependent" relationship. Which is not healthy for either one of you. I have been in your shoes- believe me you should talk with someone "professional" immediately.