I don't think you understand. So what if the sex was lacklustre. Aren't I human? Don't I have feelings? Having sex with random people you aren't committed to just playing Russian roulette with your health and heart.
You really think a guy has sex with a girl because of feelings?

“So what if the sex was lacklustre” you wouldn’t be saying that if you found out that your soon to be husband only has 3 inches. Would you care about his feelings then?