Hester an Chillingworth were married.
Roger Chillingworth was Hester's husband
their married
Chillingworth suggests that Dimmesdale is suffering because of something that he is not admitting and that something is bothering him (hinting of a relationship between him and Hester.)
Hester meets up with Chillingworth in the prison where she is being held for her public shaming. Chillingworth arrives in the colony and poses as a doctor in order to gain access to Hester and extract information about her relationship with Dimmesdale.
The discovery that Chillingworth is actually Hester's husband changes the dynamic between him and the minister, who is revealed to be his former best friend, Dimmesdale. Chillingworth's motives become clearer as he seeks revenge on Dimmesdale for the affair with Hester, leading to a tense and manipulative relationship between the two men. The revelation deepens the emotional stakes and adds complexity to their interactions throughout the story.
Hester's husband
Chillingworth is pretty much a leech attached to Dimmesdale. Chillingworth is living and thriving off the pain/guilt he is inflicting on Dimmesdale to the point where he can no longer live after Dimmesdale's death.
Chillingworth visits Hester in prison to confront her about her relationship with Dimmesdale and to assert his control over her. He wants to extract information from her and further manipulate the situation to seek revenge on Dimmesdale.
Roger Chillingworth visits Hester Prynne to exact revenge on her for her infidelity. He is her estranged husband, and is consumed by jealousy and anger over Hester's relationship with another man, Arthur Dimmesdale. Chillingworth's visit serves as a way for him to further torment and punish Hester for her actions.
No, Hester did not love Chillingworth. Their marriage was based on duty rather than love, and Hester's heart belonged to another man, Arthur Dimmesdale. Chillingworth's obsession with seeking revenge on Dimmesdale further strained his relationship with Hester.
Dimmesdale is shocked and horrified when Hester reveals Chillingworth's true identity as her husband. He feels betrayed and manipulated by Chillingworth for disguising his true relationship to Hester. Dimmesdale also feels guilt and remorse for unknowingly being involved in the scheme that has harmed Hester.
To get him to admit that he slept with Hester.