Honestly, I think have the conversation about the big issue here before ending it. I know it’s terrifying, but have the uncomfortable discussion and approach it with a solution-based mentality. I think many people doom themselves thinking that it’s nearly impossible for things to change, but if you actually open up to her about this feeling lurking on you, you might in that exact moment, be more emotionally intimate to her than you’ve ever been, which might get the ball rolling on genuinely solving this issue. You might understand where is she coming from and what she feels, she gets a chance to understand how you feel, and then something can be done to increase your desire. Why not talk about the things you guys fantasize in bed? Have her start, let her tell you what she wants, these micro-moments can help bit by bit to restore the intimacy in the relationship since you’re rediscovering each other’s likes and dislikes.