I totally thought I replied to this, so I apologize for the delay!
So Beck here was born in Deadwood, but his mother moved him and his sister out of the country when he was twelve. He has been estranged from his father ever since, but recently moved back about five years ago when he became ill. He only moved back because his sister did. Anyway! I'd love the ex to be someone he grew up with and reconnected with when he returned home five years ago. He doesn't really do serious relationships so I'm thinking he kind of gave her the wrong idea about where he saw things going. potentially he was even a bit of an ass hat. he is extremely closed off when it comes to talking about pesky feelings, especially anything related to his dad. There could have been some pressure on her part to try to reunite him and his dad and/or getting him to at least entertain the possibility of a future for them (married, kids etc.) - i'm pretty open. He definitely could've been a bit of a dick toward the end and it's totally cool if she hates his guys now haha