This is not a good idea, for me at least. I can't say for sure whether you should end your life or not. We're always told that suicide is so bad, but sometimes it is necessary. For the problems you described, it seems kind of childish to kill yourself over a relationship. You can find another one any day if you really put your mind to it. You said you've changed and he won't accept it. Move along. Find someone who will. There's a solution to your problems, you just need to want it and go looking for it.
I'm sure there is some pain you are feeling. Talk to someone about it, maybe even a therapist. If you want to end your life, you are responsible for doing it. You have to take full responsibility for it. If you're willing to do that and end your life, best of luck to you in the ether.