I think that lostbunnyrabbit's advice is good ~ possibly because she is going through a somewhat similar scenario.
Breaking up is stressful at any time, but when one is also bereaved, it makes it doubly difficult.
If you ever feel suicidal, you really must talk to someone. In the UK, we have the Samaritans:
'We offer our service by telephone, email, letter and face to face in most of our branches.'http://www.samaritans.org/I have suffered with depression, but at the time, though I felt things were too awful to cope with, I knew that things should get better ~ and I dd not want to miss the good days when they came along.
I got better and love my life. Just keep positive for the moment and I am sure that you will be rewarded by good times in the future.
What you are going through is a crisis ~ your pain is acute. But remember, it won't always be this way. Time won't take away your loss, but it will help to make your pain easier to bear.
As for your romantic relationship, this girl may come back to you ~ did you write to her, by the way? ~ or she may not. Either way, time, again, will help you deal with this.
You have been acting positively ~ that's good ~ but your bereavement will affect this. Accept the pain ~ it is normal and right, but will ease.
Believe that you will find Miss Right. It may or may not be the person you currently think that it is. But try to stay positive.
Take care and look after yourself.
Don't pressurise yourself, but try to remain as positive as possible.
Seek help and support whenever you need it.