You mention,that,after just about 5 years together, and one beautiful daughter, the relationship is now over. :(
Clearly,you're upset about this,as you've put a lot of effort in,to making it work.
I jumped right into this relationship from a previous one
NOT a good move,as you didn't give yourself "time to settle" before
Starting a new relationship :(
She told me that she has not been happy being with me for the last year.
Obviously,this "unhappiness" from your partner has been there for quite a while,now.
Were you not able to read any of the signs??
I don't think anyone else can replace her.
It's sad that you never realised this until you lost her :(... and it's going to take a
Lot of hard work,if you're going to get back with your partner,again.