It is none of his business no who you see when your daughter is not there. But he does not sound like someone who should be around your daughter and if her Dad finds out he could raise it as an issue and go for full custody and they will look into it
Here is a more succinct legal answer - it more leaning towards both being parents but in your case it could definitely fuel your ex going for full custody
*Before or within Care Proceedings, often one parent is asked to separate, either temporarily or permanently from the partner who they love (who may or may not be the other parent of the child) as a result of risk posed by that person to the safety of a child.
The parent will be asked to prioritise the needs of the child and to separate from their partner, at least for a time, whilst the risk is assessed.
This can be heart breaking for the parent who loves both the child and their partner. However, if the parent does not agree to separate it is probable that the Social Worker will ask the Court to agree a plan to remove the child from the parent’s care, either to a safe family placement or into foster care.
Hopefully once the assessments have been completed or factual allegations determined, the parent will be able to resume the relationship either because there is no longer believed to be a risk, or the risk can be safely managed.
Sadly, this is often not the case. Often the Care Proceedings and decisions about the future turn on whether or not a parent can stay away from the risky partner. It may be necessary to obtain expert evidence on this, probably from a psychologist.
When one parent is found to be a substantial risk there are only three options:
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Let parent and partner look after the child together and take that risk that the child will be harmed.
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Let the couple live together but remove the child from their care.
3)Ask the parent to separate from the risky partner and for the child to live with the safe parent. If the risky partner is also the child’s parent, manage that parent’s contact probably by limited and supervised contact.
None of these options are ideal. The first option is unlikely to be allowed by the Court. The last option is the compromise position that is often reached as the least worst option.
It is common for people, including the Social Worker and the Lawyers as well as the Judge, to suggest that a parent should be able to end a relationship for their child. It is easy to forget that these two people may genuinely be in love and that love is real and powerful and painful. How realistic is it to ask two people who are in love to be apart for the sake of a child when neither of them really wants the relationship to end?
That’s not to say that it is wrong. Of the three options above, the third is the least damaging for the child who can stay with their parent. It is probably also the best option for the parent who would otherwise be unable to live with and care for the child. We should never under-estimate how hard it may be, perhaps the hardest thing a parent will have to do in their entire life.
This is why quite often it doesn’t work out. The adults may not be able to stay apart. The risky partner may pressurise the parent to continue the relationship, probably in secret. The child is put at risk and may be harmed. Social Services are likely to find out and the parent’s chance of keeping that child in their care if the case goes back to Court are now much much less.*