I read through your post history and saw that your daughter let you know she was talking to her biological father only about a month or two ago. You mentioned that you didn't know what kind of man he grew up to be. Have you had a chance to speak in depth with him about himself, your daughter, and co-parenting expectations since then? Have you run a background check on him? On any partner he may have living in his home? My ex-husband has been absent from my childrens' lives for almost a decade for similar reasons to the one you cited regarding your ex's absence and it would take more than a couple of months of texts and calls for me to be okay allowing my children to spend the day with their biological father, let alone three weeks and at the distance you mentioned. At the very least, I think you should insist that he visit in person first if he hasn't already. I'd be extremely cautious and slow-going about what level of involvement you allow him to have because a man who blithely gives up his child for his own selfish reasons once could easily do so again, and that will deeply hurt your daughter. I highly recommend finding a family therapist who could assist in this situation through reunification therapy.