There's a possibility that he was a bit of a rebel. He might have had a wild side that Beckett was initially attracted to but later found hard to handle. He could also be artistic. If Beckett is into art or something creative, he might have been an artist or had an artistic soul. This could have drawn them together at first, but then differences in their artistic visions or the instability that often comes with an artistic lifestyle could have driven them apart.
He could be ambitious. Maybe his ambition got in the way of their relationship. For example, if he was too focused on his career and didn't have enough time for Beckett. Also, he could be possessive. Some relationships in fanfics end because one person is too possessive, which makes the other feel suffocated.
I'm not sure which specific 'beckett's old boyfriend fanfic' you're referring to. There could be various interpretations of the character depending on the plot and the writer's vision.
He could be a charming but unreliable person. In fanfic, this type of character often seems great at first but then lets Beckett down when she really needs him.
One possible reason is that she is in danger. There could be someone or something that wants to harm her or her unborn child, so she has to disappear to stay safe.
One possible reason could be that they are on a secret mission. Maybe they are trying to protect a key witness or important evidence from a powerful and dangerous criminal organization. In the world of fanfic, this could lead to them having to disappear to keep their whereabouts unknown.
Well, in fanfic, Beckett's ex - boyfriend could be portrayed in various ways. He might be the typical 'bad boy' type who broke her heart. Maybe he was self - centered and didn't appreciate Beckett for who she was. Fanfic writers often use ex - relationships to create drama and character development for Beckett.
One possible plotline could be that Castle, in his over - the - top way, proposes something like a wild undercover mission where they have to pretend to be a couple in a very improper situation to solve a case. Beckett is initially shocked but then realizes it might be the only way to catch the criminal.
The kidnapper could be an estranged family member of Beckett. There might be some family feud or inheritance issue that leads them to believe that by kidnapping the baby, they can gain an upper hand. Or it could be a completely random person who has a mental disorder and randomly targeted Beckett and the baby because they saw them as an easy target.
One possible plot could be that a girl who has always been single during Christmas wishes upon a star one night. The next day, she meets a charming stranger who seems to be perfect for her. As they spend time together during the Christmas season, they discover they have a lot in common, like their love for hot chocolate and Christmas carols. They face a small conflict when the girl's overprotective best friend is suspicious of the new guy, but in the end, they realize they are in love and have the best Christmas ever together.
Maybe he's afraid of losing her because she's his partner and they've been through so much together. Their relationship is very important to him.
She might go back to her old boyfriend because of familiarity. They already know each other well, and she may miss the comfort of that old relationship. Maybe they had some great memories together that she can't forget.