Why are we doing this?

I recently stumbled upon a post where the author stated that he can't marry the lady he is with and some people were bashing him without knowing his reasons . I made a post some days back regarding the grief I'm feeling for breaking up with my lover and some were accusing me of not loving her . First just because you like someone and have talks about marriage that doesn't Automatically mean you must marry . If I notice a behavior from you or any other thing that won't make us to be compatible then I have every right to call it off just as you . There's what's known as courtship stage in a relationship,it is in that stage that two potential partners tend to know more about themselves and investigate. If I notice the girl I'm to marry has something that I can't tolerate or will ruin our marriage in the long run , does that make me a bad person ? You can be with someone and along the way you lose interest and realize they were not who you thought they were in the first place , It doesn't mean you want to play them or anything like that. I broke up with my ex because I felt i can't give her what she's asking of,I've sacrificed a lot and done things I haven't even done to my mom but still it wasn't enough for her . Just because I decided to call it off just so both of us can have peace of mind . I was told that I never really loved her and all sort of things . I just laughed at it .