Hi,
first i would like to inform you that don't take any steps in
depression like killing yourself or else.
I would glad to inform you that you could forget all this too as he met you and you forget your past so think positive because you could also forget all this things.
I know its easy to suggest and hard to do but all you have to do is this.
I can't say here that he is not serious about it, but it might be possible that he had a reason to be not with you.
So, i would like to say that try to make him happy with what he want.
I know that you love him as you describe in your question but sometimes its not possible to be with your love for lifetime.
"Love doesn't mean to be with him/her for lifetime"
You should have to understand that line and try to improve yourself by involving you in some other activities which could divert your mind.
You may concern
psychiatrist if my advice doesn't work.
Try to follow my advice if not work than concern a good doctor they will suggest you for the best.
Hope you will short it out in much time.
good luck,
Thanks & Regards,
Dr. Gaurav Prajapati