<human>: I'm a separated father [36] from their German Mother [40], for the last 8 years and we have two children [13 and 11]. We have remained good friends and I enjoy a healthy relationship with my kids. I'm also their legal guardian.

The mother is now pregnant and wanting to move back to Germany to be with the baby's father who, also wants to marry her. He seems quite genuine. But doesn't have any relationship with my kids.

She wants me to allow her to take the kids, and we can work out maintenance and visitation (currently in mediation sessions for this.) All this she wants done by June as the lease on their current house is up then.

Here is where I'm torn on one hand and currently getting cold feet about letting my kids go. I have no problem keeping them here with their friends and schools. Also I emigrated at 12 and although the circumstances were different, I did find it very tough  for the first few years.

Does anyone have any stories similar to mine [Summer time visits]. As it seems most Dad's I talk to are "You gotta keep the kids" and most Moms I talk too are like ... "Oh, you're going to miss the kids" ....

Whats the best possible solution when it seems everyone is getting hurt?

Can you summarize the given text in a few sentences?
<bot>: Mother of my two kids wants to leave the country to be with new fiance ... they need my permission to emigrate with my kids.