Dear @Simi,
Welcome back at Wefugees and thanks for reaching out to us again.
I'm sorry to hear that the father of your child doesn't want to be involved or have any contact at the moment. Unfortunately, you can't force him to have contact (the situation is different when it comes to child support obligations, of course, but I assume that has been clarified?). However, this may be for the best, as forced contact is usually not good for the child—you want to protect them from possible rejection.
However, he can also not simply show up and disappear again if this is harmful to the child. In this case, the youth welfare office ("Jugendamt") can provide advice or a court can make arrangements. Even if the father does not want any contact, the youth welfare office can advise you on how best to protect and support your child. For example, how you can talk to your child about their absent father, how you can cope with emotional stress, or what support services (counseling centers for single parents, etc.) are available.
Are you already in contact with the Jugendamt?
I wish you all the best in finding a good and stable path and please don't hesitate to get back to us with any further questions or with updates.
Regards,
Meike