Atheists in church

[Spongebob]

I need qualifications to talk about marriage and you think I tried to define marriage. OK buddy.

Consider your statement:

Marriage is pointless, means nothing. 

This statement sounds absolute to me and it's simply not true, not objectively anyway.  So, the question is did you mean this to be an absolute truth, or are you just saying within the context of morality, marriage is not relevant.

But you continue to say this:

I can fuck who I want if I'm married or not, if they consent (of legal age obviously*). If you consider cheating after marrying immoral I can accept that you can form a valid argument for it. But you need to realise some relationships, even marriages, are "open" (some two sided open, some one sided). Cheating in a relationship isn't something I've done. I could see why someone could think it's not immoral though. 

It is certainly true that you can have whatever sexual relationships you like whether you are married or not, but within the context of morality (which I will equate to ethics), this cannot be objectively true.  My wife and I have a mutually agreed upon understanding of marriage and within that, having sex with others is not an ethical/moral thing to do.  If we had an open marriage it might be different and people are free to have those kinds of relationships.  But your statement about marriage is not objectively true, only subjectively.  This is all I was pointing out and I was doing that because of the line of thought that was going.  I could explain further but I sense you are becoming obstinate and not open to discussion.