Is my partner over her previous man who died?

Ive been with my girlfriend for over 2 years now, and we have 1 child 2getha. She has 3 other children and one to boy 2 a partener who died of a heart attack. When we met she told me how she grieved for 2 years before even being with someone else. She said when they were 2getha for five years they only had 2 arguments. That he was loyal, provided for them, and he always put her first. Weve had alot of arguments mainly over jelousy. She over our time 2getha has said that she gets signs of her ex for eg..another number plate saying 'Ray" or date of birth things n stuff like that. I just feel that he was a flawless man and i cant live up the expectations of him. She says that we are soulmates and not to try and be him. This is so hard to live like an underdog..i have put her first on my list, I hope she has too. What do you think anyone been thru this..has she gotten over him? am i the one? or am i just filling in her time? Wemon plaese give me some answers????