I'm going to assume she is not a complete dumbass for a second. I'm going to assume she knows she planted the seed of doubt in his head with the initial statements. In order for her to successfully pull off lying and rip the seed from the ground she needs to be a fairly decent manipulator and OP needs to be at least half a dumbass himself to not put it together. Rates of dumbass in OP depend on how good of a manipulator she is. If she's a damn good manipulator, it may a while before OP lifts the fog and gets out.

With a seed of doubt planted, it takes a level of finesse to remove it.

I'm gonna assume she is a dumbass. Being a dumbass and being a fairly decent manipulator don't generally happen. So OP needs to be bout a full dumbass to not catch it.

No matter how this goes, lying only works if we assume OP is a dumbass. But I'm gonna give her the benefit of the doubt, and also assume she does not think OP is a dumbass, as there is nothing in the post to make me suggest otherwise. So moneys on she leaves the genie out until OP corks it or smashes the bottle.

Also, nowhere does it say she is forcing herself too. Just that its not the best. I fuckin hate operas. If you see me at one, it's because of whoever I'm with. I enjoy their company, they enjoy operas it seems, so I'm doin it to enjoy their company, not for the opera. It's something I have conceded to enjoy their company. It's not a deal breaker for me to have to see a fuckin opera every weekend. Who knows, maybe I will grow to enjoy em in the process. For this chick, sex with him may be operas to me. Some people place a high value on sex, some don't. Your insecurities say more about you than them. The comparison holds when you realize sex IS NOT a highly valued thing for everyone, and is valued as much as an opera.

A high value and low value can work, but will only work, if the high value isn't insecure about the value and can accept it isn't exactly a personal hit on the them.

The key to this is not this conversation. It is the value she truly places on sex. If she places a high value on sex, it will indeed implode on them. If she is more of a 'ill take it if it's there, but eh' type of gal, it is not necessarily going to implode unless he blows his insecurities all over the place.