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Its not really something that I could control though. You can't (nor I think one should ever) train love. You love what you love, and who is anyone to blame it for shutting off. If this happens to you, you will very likely still think the person you are leaving has a fantastic personality, and it is truly a shame this is happening to you. Being shallow is not giving that aspect any importance, rather than not giving it enough to stay. Because if you stay despite not truly wanting to, you are punishing yourself over what should be a positive relationship, and it is quite possible you will turn it sour and toxic in no time.
If they have gained significant amount of weight you have to ask why. Maybe they are going through a depression? If they aren’t willing to try getting healthier than no I don’t think you should be shamed for not being physically attracted to them anymore. 
BUT if your significant other had a traumatic accident or disease and they CANT help it or they naturally aged and you leave them I feel like yeah you deserve the shame. LOVE goes beyond the physical appearance of someone. If you could just easily leave a person over their physical body and be ok living without them for the rest of your life then you never truly loved them to begin with. 
“Should the other person really be tied for life to look after someone” just don’t get married if that’s how you feel. “IN SICKNESS AND IN HEALTH”. Swear the human race never ceases to disgust me. >

Oh don't worry, I don't really believe in marriage. And my partner will be aware of this, that this should last what it should last, and if this is a deal-breaker to them, they are perfectly free to step aside, I won't complain. I was just curious for others' input on this.
I understand people process love in different ways. For me beauty is concrete and abstract. And if I fall in love with someone it is because I appreciate every aspect of them, not excluding physique. And sure, the chance that their personality is so great that it could totally eclipse my desire to fulfill physical desires is always gonna be there. But if that chance doesn't happen for a particular person, I don't feel it is fair to judge me for it. But then again I should be transparent of what I believe and what I am looking for. >

Will definitely judge you on something so shallow. I am attracted to the whole person for who they are. Not just cause they look hot. If you’re an a-hole and attractive then I won’t even give a sideways glance. When my husband is being supportive, kind, a good father, loving etc I’m way more attracted to him. Good luck with finding a woman who is fine with you just leaving them cause they didn’t age how you wanted them too. Waste of space tbh >

It depends of what you believe love is. I think it's supplementary rather than necessary. It's more important to love yourself first, instead of searching someone to "complete you". Because that would put a burden and dependency on the other person. If you love yourself, you are never really lonely as much as you are just alone, and you are fine with that. And finding someone else is a nice bonus, most definitely, but not necessary. >

I never said it was necessary to love someone or be loved by anyone. Love isn’t something that you can just turn off because your partner got into a car accident messing their face up or got cancer and their hair fell out. Your attraction goes beyond the physical body. If you think love is just something you can just discard of when it’s no longer convenient for you then you’re just wrong and sad. >

You said it yourself. Love isn't something you can just turn off, just as it isn't something you can just turn on as soon as it slowly starts to turn off. See my point now? Never did I imply making an actual effort to stop loving someone. You can't control love, neither to turn it on or off. >

But if the only reason the love is “turning off” is bc they aged, got a disease or procedure than you should be shamed because you are just a shallow human being. Idk what’s hard about that.