Car would only start if I used starting fluid, now car won't start at all.

What is your question?

I have been having problem after problem with this car lately it only has 86,000 miles on it & pretty much has been babied for lack of another word. Well my biggest problem lately is it started giving problems starting it would crank just not turn over noticed security light would come on have had to play a game of switch the keys around daily, well now car would not start without starting fluid that was up until today now car will not start even with starting fluid getting the message service fuel system and security light still blinks at different times no pattern in when light decides to blink or not blink. Only code I get that is Current is RFA 2560(think it's B2560 can't be for certain sorry)something to do with Remote Keyless Entry which could someone elaborate more on this as well please and thank you.