not 100% sure on if i need the line filled yet but here are the details.
they were childhood everything because their mom's were friends. she was 18 when she got pregnant. he was 17. she broke up with him saying that she cheated (if she did or didn't is up to you but she knew it would drive him away). no one told him anything. even his mother knew and didn't tell him. he found out about his kid about a month ago.