Is there’re any drafts or guides on the subject or something that explain the subject?
Hello!
I suppose that you want something like that https://vironit.com/how-to-create-a-dating-app/.
Though you can get the source code of the tinder for example by looking for the source code of its clones. It’s hell of hint 
Maybe this link is not for developers, but there’re all about the business logic of dating apps - https://www.cleveroad.com/blog/create-a-dating-app