Sis in law other women in supposedly open relationship

[Wells37]

My sister in law (late40s) is divorced and has young adult children.
She's having a relationship with a married man. He also has young adult children. Relationship has been going on for a few years. She says he has an open marriage and his wife sees other men. She only contacts him on a messaging app called Kik not text or what's app.
I think she's being very naive about it all and think it's most likely he's having an affair and not in an open relationship.

Do people really have successful open relationships? Or do you think my suspicions are correct? I really can't get my head around it and she knows I really don't approve.

If the messaging is done on kik then it’s not an open marriage he’s in

Yes people definitely do have open relationships but men also cheat so it could be either. Don't assume it must be an affair though because you don't believe open relationships exist because they do.

Sounds like it could be either, however if they genuinely had an open marriage then I would expect they would be open and honest so messaging etc wouldn’t need to be secretive.

Either way it sounds messy, I’m unsure those types of arrangements would end well, look at those people on Sister Wives, they all ended up getting fed up with it in the end.

I think your sister is leaving herself open to problems later on.

He says it has to be secretive as his kids and family friends don't know they have an open relationship.

I don't suppose there's much I can do but I feel like he's going to cause a lots of hurt at some point.

Some cheat and some have open relationships. Many in open relationships do keep things quiet because part of the agreement is that the other person doesn’t have to see it going on and that family and friends are unaware.

If your SIL believes he is in an open relationship then I think you have to take her word for it. The types of relationships that consenting adults choose are for others to disapprove of.

No one doing anything above board uses kik.

I hadn't heard about it until she mentioned it. It's for hook ups etc isn't it ?

Yes you're right, I know I shouldn't judge. I do secretly though!
I feel he's probably taking everyone for a ride.