This would be one Hell of a blow to the ego,
If you were describing this using Red Pill praxeology, you’d say she went through her “epiphany phase.” In other words, she’s getting close to the big 3-0, realizing she isn’t getting any younger and reevaluating whether the way she’s living her life is going to get her what she really wants in life.
In her case, she had a guy she had “mad sexual chemistry with,” but she recognized that he wasn’t a suitable guy to settle down with. On the other hand, the man in question was the type of guy she could see spending the rest of her life with, BUT she had no sexual attraction. So, I’m sure she did what so many women before did in that situation. She faked it. She oohed and ahhed and told him he was amazing in bed and either he was naive or she was just an amazing actor and he believed it.
Now he recognizes that he’s in what Red Pill guys call an “Alpha f****, beta bucks” situation. In other words, she had sex with that other guy because he turned her on and excited her. She’s having sex with him not because she wants him, but because she could see herself being with him long-term and so, she is using sex to help reel him in.
So, what should he do?
Well, first of all, it’s worth keeping in mind that there are an awful lot of relationships that end up playing out like this and yes, some of them do work. But, they are often fraught with problems. For example, what happens if they get married and after 5 years of faking it, she just can’t stand it anymore. Maybe there’s a dead bedroom. Maybe she cheats. This happens all the time. Now keep in mind that he has to live with the knowledge that she isn’t really sexually attracted to him. Yes, she claims otherwise, but he doesn’t believe her and he probably shouldn’t.
It all comes down to whether as a man, you can live with the idea that even your girlfriend isn’t sexually attracted to you. From an ego perspective, that would be hard for most men to deal with, especially if things don’t work out down the road. What could you say to yourself at 40 if you got married to a woman who you knew she had no “spark” with and it all blew up? So, I don’t envy that guy, but I would say that since it’s a two-month-old relationship, it probably makes a lot more sense for him to just move on.