moms new boyfriend!

[kell74]

my friend has been seeing her boyfriend for a good few months now, and her eldest son was alright with it in the begining, but now he is making life really difficult when he comes around, and especially when he stays the night, she doesn't know what else to do as she feels as she ha tried everything can you give some suggestions please

[AHP84]

RockRose is right. In these types of relationships, the mother-child bond should always be the first priority, because a parent is a child's only means of support, stability, and protection. If a child feels this is being compromised or taken away, (s)he's probably going to act out.
This isn't to say that the single parent shouldn't date or have a sex life, but that it must always be understood that the child needs to come before any of that. Their needs have to be met first.
The boyfriend should not be spending the night if this is what is causing the boy to act out. You said he was alright with the relationship in the beginning, well, assuming that most relationships are not sexual in the beginning, that's probably why he was alright with it. This was just a guy that came around here and there.
But now he's intruding in the boy's most crucial aspects of life--his mother and his home. He probably just needs more time to adjust; some kids take longer to adjust than others, but if the boyfriend is patient and cares about the child as much as he does the mother (which is how it should be with a potential step-parent), then both he and the mother will wait as long as need be for the child to adjust to and accept the relationship.
And if the mother and boyfriend want to have a sexual relationship, then there are probably plenty of other options to do so without him having to spend the night in her home.
Ultimately though, a single parent should keep a dating relationship very limited with, if not completely eliminated from, their child's life for the first few months to a year, unless the parent is 100% certain that their child is accepting of the relationship and that their partner is 100% trustworthy with and around their child.

[RockRose]

You say she has "tried everything".  Has she tried not having the boyfriend spend the night?

You don't say how old her eldest son is,  but maybe he thinks it's inappropriate for his mother to have a man sleeping over in her bed that she's only been dating a few months?

I would disapprove too.  Can't really blame him,  sounds like he has his head on straight.