<human>: I'm in the perfect relationship for over 3 years. He's never done anything to make me think he'd cheat on me or leave me. Our relationship is very give-and-take and we're great at solving problems together. I just can't shake this feeling that one day he'll get tired of me and it will end like, what, 70% of all other married relationships? 80%? I will get cheated on, we'll go through a divorce, I'll have to change my name back etc etc... I don't see the point in getting married because of this. Or even stay in a committed relationship.

I've talked to him about it and it just makes him upset. He says "we're different" but really, how many people claim that about their relationship? I think we are something special considering all we've been through, situation-wise, and all that we've sacrified for each other... But it doesn't change the statistics or the fact that people get tired of each other after 20 years or 10 years or even 5 years.

I've talked about the possibility of polyamory with him just to get this anxiety out of my head. If cheating is accepted and expected, why get upset over it? Right? I'd have to completely change my mindset and view of our relationship to be okay with it, but at least I wouldn't have to worry. This is not something he's comfortable with AT ALL, so I've since dropped it.

I'll stop typing now...

To those of you in long-term relationships or married, how do you deal?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: 3 year perfect relationship, can't shake the fact that the end and/or cheating is inevitable, boyfriend doesn't feel the same way and doesn't like that I think this, how do I deal?