A father has revealed that he is struggling with whether or not he should tell her daughter's soon-to-be fiancé that she's a sociopath who doesn't feel love or empathy.

Reddit user Pause96 posed the question on the 'AmItheA**hole' subreddit last week, explaining that he loves his 25-year-old daughter 'very much' but thinks her unsuspecting boyfriend 'deserves all facts.'

'I’ve been able to have a good relationship with my daughter and I enjoy my time with her, but there’s one thing about her that would give many people pause — she is a diagnosed sociopath,' he wrote.

Tough call: Reddit users couldn't decide what a father should do after he asked whether or not she should tell his daughter's soon-to-be fiancé she's a diagnosed sociopath (Stock Image)

'She exhibited odd, disturbing behavior at a young age, and after a serious incident of abuse towards her younger sister, I realized she needed professional help.'

The father recalled how his daughter would get in trouble for lying, cruelty, and general misbehavior when she was in elementary school. However, with the proper therapy and support, her 'bad behavior was minimized as she grew older.'

At the age of 18, she was diagnosed with antisocial personality disorder (ASPD), a mental health disorder characterized by a disregard for other people.

The dad noted that she abides by the law, has a decent job, and a good education as well as 'many good friendships and admirers' — particularly male admirers.

'She is very, very charming and adept at attracting guys and maintaining their interest,' he explained. 'She uses that old dating guide "The Rules" like a Bible.'

The Reddit user said his daughter's boyfriend of a year and a half is 'crazy about her,' and he has developed a close relationship with him since they started dating.

'He is a great guy, very kind, funny and intelligent,' he said. 'But I doubt she loves him. We’ve had some very honest, in-depth discussions about her mental health since her diagnosis, and she’s been open with me that she doesn’t feel love or empathy towards anyone, even family.'

He recalled his daughter acting broken up at her friend's funeral only to later confess to him that 'it was all a put-on' because she felt 'pretty neutral' about the loss.

Antisocial Personality Disorder Symptoms: Disregard for right and wrong Persistent lying or deceit to exploit others Being callous, cynical and disrespectful of others Using charm or wit to manipulate others for personal gain or personal pleasure Arrogance, a sense of superiority and being extremely opinionated Recurring problems with the law, including criminal behavior Repeatedly violating the rights of others through intimidation and dishonesty Impulsiveness or failure to plan ahead Hostility, significant irritability, agitation, aggression or violence Lack of empathy for others and lack of remorse about harming others Unnecessary risk-taking or dangerous behavior with no regard for the safety of self or others Poor or abusive relationships Failure to consider the negative consequences of behavior or learn from them Being consistently irresponsible and repeatedly failing to fulfill work or financial obligations Source: Mayo Clinic Advertisement

'She has also stated she has never once felt guilty about anything she’s ever done, and doesn’t know what guilt feels like,' he added. 'While she enjoys being around her boyfriend and is sexually attracted to him, I highly doubt she feels much of anything towards him love-wise.'

The father believes his daughter's boyfriend may propose soon, which concerns him because he 'has no idea about her diagnosis.'

She has been upfront about the fact that she doesn't ever plan on telling him she has been diagnosed with antisocial personality disorder because she thinks 'it'll scare him away.'

Although he has warned her that she has to tell him the truth before they marry or he will, she always says she knows he 'wouldn't dare.'

'I actually would,' he admitted. 'I really like and respect this young man, and would feel awful keeping this "secret" from him, and letting him walk into a marriage without this piece of knowledge.

'I’m not trying to sabotage my daughter’s future,' he added. 'Maybe her boyfriend’s love of her personality and other aspects is enough that it won’t end the relationship.

'It's his decision to make, but he deserves all the facts. Someday he’s bound to find out she’s a bit "off"; it can’t be kept a secret forever.'

Reddit users struggled with the difficult decision, with many agreeing he should just let things play out naturally.

'Wow. That's the hardest AITA I've read in a long time,' one person commented. 'You're ethically compromised either way. It's probably best you stay out of it.'

'It's hard because she could unleash a world of pain on him,' another Reddit user explained, 'but on the other hand she might not...then on the other hand imagine finding out this woman you hold so high doesn't actually love you....'

'Maybe discuss with her doctors what you should do?' someone else suggested. 'This is really a damned if you do damned if you don't.'

One person said the 'big concern' is whether they plan on having children together.

'I think a sociopath runs a very high risk of being a bad parent,' the Reddit user said. 'I'm putting that mildly.'