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Firstly you need three characters to be in love you, they go to bathroom, living room or bedroom and click on the three hearts 

Yes your game will save, but you need to keep the old version on your device then download the update so you won't loose your progress

Complete all the stories with the Cat girl she will take you to her

Click on achievements, click on the achievement that says *you cheating my man* and there you go

no you can't if you read it in the latest patch notes, they removed it only way to access it, is by activating cheats 

You have to activate cheats by going on the achievements and clicking on cheat achievement to activate the cheats, then go on the pause menu and click on unlock scenes

You have to work at her shop and gain a certain amount of points or keep working there, one of those then ask her out

You have to activate cheats, so go in the achievements scroll down, and click on the achievement that says *you activated cheats* something like that after, click on the question mark and click on the cheat that says gallery, after go to your computer and it will be unlocked there. Also that scene can only be seen in the gallery only, it has been removed from all platforms not just android 

Complete all cat girl stories then she will take you to get house and you meet the last girl

When the store is closed go to the alley and there she is

Go to the bin in the park there is a red gem, after give the cat that gem

First go to the beach then pick up rubbish after picking up three of them, then talk to her and it gives you an option to date her 

You have to unlock all partners, after go to either the bedroom, sofa/couch or bathroom then click on the three heart icon