<human>: Give me a shortened version of the text

Ok. I feel like I need to do this for myself more than anyone else. So please feel free to ignore this. I just need somewhere that I can write this down and get it straight in my head. For obvious reasons this is a throwaway.

So I've been in a relationship for almost four years. We were apart for about six months of that when I broke up with her but then we got back together. I am fairly happy with her but I don't feel that excited to see her. We live together and it's fine but I am not as excited as I have been in previous relationships. We're both 29 and our friends are starting to have babies. I don't think that I can have a baby with her. 

I'm about to move home from North America back to Europe (I'm European, she's from here) and at the moment she's starting to work on getting a visa to come over. 

I know what I need to do. I need to end this relationship but she has no idea how I feel. She loves me a lot and she will be destroyed by this. 

I know that I have to do this but I don't know how to. I've personally set deadlines for myself that have come and gone, I've told friends that I'm thinking of doing it and haven't done it. Now I know I have to do it before I get her to move half way around the world and I don't know how to do it. I know that I'm a jerk who is wasting my time and hers but I really don't know how to get to the point and do this. I'm scared that I'm going to wake up in 5 years time still in this relationship that has never been bad but hasn't been as exciting as it could be.
<bot>: I have to end this and I'm terrified of hurting her even though I'm being worse in the long run. I'm a big coward.