Unconditional love

I've just watched a documentary on TV about an English man who thought he was really smart.  He got addicted to smuggling hash from Spain into the UK.  It started by him physically wrapping blocks of it to his body and only travelling with hand luggage.  One day his Spain agent approached him and asked him to help him with 500kg which was not very well organised, the long of the short is he got busted by the Spain police and spent three years in prison.  Just before he decided to take on the last job he was out celebrating at a restaurant with his girlfriend, who at the time knew nothing of his dealing but she started to suspect something and asked, he confessed, however he continued.  When he went to prison she gave him unconditional love and they wrote to each other every single day and he refused to let her see him in prison.  Now how does a woman do that?  Well I suppose the reason I ask that question is because I don't think I could give someone that kind of unconditional love.  Maybe the writing and communication helped?