could someone please translate these 3 quotes for me? dying to know the meaning :)

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could someone please translate these 3 quotes for me? i'm just dying to know the exact meaning and i'm pretty sure google often doesn't do a very good job. it's from two movies, i'm okay with general translation but these specific quotes i'd like to know the exact meaning. i also wanted to say that i fell in love with chinese movies and language ever since i discovered them, the culture and food i loved for years, sadly over here you can't get a lot of stuff to cook everything. i plan to learn some chinese, which i know will be very basic because i already speak 3 languages and i have extremely bad memory which got even worse after taking some meds for years due to my chronic illness which makes it hard to function. anyway, will be really-really grateful if someone gave me an exact translation of these quotes, thank you very much in advance  ? 

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also, if anyone could translate the quote "your weakness is your defeat" that would be great, it's my favourite quote and i'm collecting it in different languages, again i'm unsure if google will give me a proper translation that why asking here, hope someone doesn't mind helping me, thanks  ?

[Jim]

原世间所有爱，都能被真心对待，不留遗憾。

I hope that all the love in the world can meet with wholehearted sincerity, so there are no regrets.

[Much clumsier than the Chinese, can't wrangle it into anything better without spending more time than I'm willing - I take it to mean wish that when someone loves someone they are dealt with honestly even if it doesn't work out]

 

回不去也得回

You can't go back but you must.

 

就算你恨我 我也要这么做

Even if you hate me for it, I'd still do the same.

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thank you so very much for the translation, you just made my day! ?  really, thank you from the bottom of my heart  ?