A WOMAN has shared her heartbreak after her fiancé fathered his own nephew via a sperm donation - and now wants to become an ''active dad''. Seeking advice on Reddit, she explained that her fiancé had previously donated sperm to his brother and ex-wife to help them conceive after the couple were struggling naturally. She wrote that her fiancé had originally agreed to act only as ''uncle'' to his child - but has now changed his mind and is determined to take on the role of the father, despite her being ''completely against'' it.

The woman revealed that the reason her man had needed to provide sperm was because his sibling ''refused'' to seek fertility testing, fearing others would think he was ''less of a man''. However, the pair were desperate to have a baby, and ended up asking the brother to secretly provide sperm so they could fulfil their dream and finally conceive - a decision she admitted she ''wasn't comfortable'' with.

Sharing the story on the 'Am I The A******' Reddit thread, the woman wondered if she was in the wrong for being upset about the situation and admitted her engagement was ''hanging in the balance''. Social media users were quick to urge her to end the relationship and ''leave'' him, accusing her partner of a betrayal - while others suspected the donation was nothing but a cover story for cheating on her.

She wrote: ''I need advice because my engagement is literally hanging in the balance right now. ''My fiance donated sperm to his brother and his ex-wife because they were struggling to conceive naturally.''. Though she was against the idea, she felt it was pointless to express her opinion. ''But my fiancé comes from a close knit family so I knew I wouldn’t be able to convince him not to help his brother so I didn’t even try,'' she said.

At first, the intention had been for the couple to go on to raise the child as it belonged to the two of them - however, things swiftly took a different turn. The brother ended up divorcing his wife as he ''couldn't cope with the fact that the baby wasn’t biologically his''. Looking to support his nephew, the woman's fiancé insisted on helping his newly-single sister-in-law financially, not wanting to leave her strapped for cash before she had even given birth.

While the woman did acknowledge the sister-in-law was likely the ''biggest victim'' in this, the woman bravely admitted the situation had made her ''uncomfortable''. Alongside his offering of financial support, the fiancé was also allegedly showering his sister-in-law to ''gifts'' and was accompanying the single mum to medical check-ups. She explained: ''To an extent I was okay with this because she’s probably the biggest victim in all of this and my fiancé’s brother is a huge jack*** for putting her in this situation, but it did make me uncomfortable when he was buying her gifts to “cheer her up” or going to doctor appointments with her.''.

Since the conception and pregnancy, the sister-in-law has given birth to a healthy tot. But much to the horror of the woman, her fiancé has now also made the decision to take an active parenting role since he ''doesn't want his biological baby to grow up fatherless''. She went on to explain that the sibling implied his ex-wife had been ''unfaithful'' and that her fiancé wanted to safeguard the child from being ''shunned'' by the rest of the family.

The woman was left horrified by the decision, adding didn't feel comfortable accepting another woman in her life - or to become a stepmother. ''I’m completely against this because it was bad enough that I had to accept another woman birthing his child before me but I don’t want to be a stepmother,'' she lamented. Her fiancé had previously assured her he would only act as an uncle, but changed his mind right after the birth.

''The agreement was that my fiancé would be only an uncle to the baby which is something I can cope with, anything more is too much,'' she said. ''I know this isn’t an easy situation for the ex and I sympathise with her but this isn’t my problem. ''She shouldn’t have let her husband push her into something she wasn’t comfortable with and my fiancé has already done more than enough for her.''.

Desperate for advice, the woman asked the popular forum how she should deal with the situation. Dozens in the comments strongly advised the woman to leave her fiancé and that the child was ''his son, not his nephew''. They wrote: ''Well, there are now 3 in this relationship and you got the short end of the stick. ''Break up and move on, your fiancé will not abandon the child nor its mother. ''You are one too many. There's nothing to forbid or allow, you have not really a say in this mess.''.