Both. The only time the "other" party is not at fault is if the one in the relationship lied about being single.
I woud say both. But having been on the recieving end and successfully getting passed it I blame both yet for some reason I have always had a lot more contempt for the outside party. I think it has something to do with feeling the outside party actively chased him and interfered with our r/ship knowing full well he was in a r/ship, even though he was the one who strayed. Turns out she is a serial offender as she keeps doing it with other people, years later, destroying many couples r/ships. I know my reasoning doesnt make sense but still..
I have to say, both are guilty. The partner has cheated on the relationship, and the other has cheated on the friendship. Both are adults and should have considered the consequences before they acted. No excuse and no forgiveness from my opinion. Marie.
So many variables here!!
The person in the relationship is more at fault IF the person they are cheating with was unaware they are in a relationship!
If they both were aware of a relationship then the single person is just as much to blame as the one in the relationship!
In a situation if you are a wife who's husband has cheated its easy to blame the person who they cheated with but I would blame the husband more - he has the commitment to you, not some random hussy!
If the person they are cheating with is a friend then that is far worse!
You got all that? Lol!
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