Bucky: You're the most jealous man I've ever met.
Dex: Do you know other men?

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Bucky: You're the most jealous man I've ever met.
Dex: Do you know other men?
"You can run away from your past, but your past will never run away from you."
Dex pretends to "casually" bump into Bucky, however, Bucky has already realized that Dex is stalking him, but he doesn't say anything because he finds Dex's attempts interesting (and because he also knows that it would be useless to tell Dex to stop, so he lets him be).
They are always the first ones up in the tower, so they have breakfast together. Although they argued a lot at first, they've gotten used to it and it's become part of their routine.
Bucky is Dex's (mandatory) emergency contact and always picks him up from the police station (even though he doesn't want to).
Dex is pleased to see Bucky, but Bucky is fed up with receiving hundreds of calls from police officers asking him to come and check on Dex.
"God doesn't love you. Not like I do"
Dex: How did you find me?
Bucky: You're easy to find, my love.
Dex is a person with an unusual character, as he tends to be unstable, lacks empathy, and has a desperate need for control, which is why he often gets into trouble (he brings it on himself), so he has a "moral compass" or as he likes to call it, his "North Star".
His North Star is someone who keeps him in check and to whom he can anchor himself to "repress" his violent tendencies (or at least he tries to).
At first, his North Star was Julie, but after losing her, he lost control and remained lost for a long time, but then, as if by fate, he found him.
Bucky Barnes, formerly known as the Winter Soldier.
Dex couldn't believe he would ever meet one of Hydra's best agents, but he had, and Bucky had become his current "North Star" even though he didn't seem at all happy about associating with him. However, one of his virtues (if you can call it that) is his determination.
One day, when Dex "casually" bumped into Bucky at one of the cafes he knew he frequented (he'd been gathering information about his routine for weeks), he became obsessed with him.
His obsession with Bucky drove Dex to become a Thunderbolt to be near him. It wasn't difficult to convince a woman like Valentina Allegra de Fontaine, because after he demonstrated his abilities, she immediately told her assistant to prepare a room for him in the tower.
Dex didn't like the idea of sharing his space with anyone other than Bucky, but he'd try if he wanted the man to become his "North Star".