What is the feeling when you fall in love with an impossible man

At an airport waiting for a ship.  
here the verb+ing is like describing what you were doing and doesn't need you to state the subject if you want to use ''to wait'' state the subject...I am at the airport to wait for a ship''
Like wanting to watch snow in summer.
Can not stop cheating yourself,he will love you.          
  stop + to means you quitted doing some activity to start doing another one like stopped walking to buy something
Example:  I stop to buy vegetables by the supermarket every day.
where as stop + verb ''ing'' means you quitted or stopped something which in this case is the verb after ''stop''
Example: I stopped smoking ... means I gave up smoking or I no longer smoke
I was not born when he was born,I was born when he was old.    (I am not particularly sure ''when he was old is right here)
I am accustomed to leaving (accustomed with ''ed'' as an adjective it is either followed by a noun or verb + ing)  a seat (sat is not a noun...but Sat with capitals can refer to Saturday) beside me,I still believed he will come. ( I still believed he would come OR I still believe he will come) I think using anyone of those would be better in here.
Everything became boring. (Everything is getting or becoming boring or as Adrian said (has become) and I guess it fits better here.

What is the feeling when you fall in love with an [impossible]*/unobtainable ? man

At an airport waiting for/to wait for a ship.
Like wanting to see/watch a snow in summer.
Can not stop to cheating yourself, he will love you.
I am was not born when he was born, I was born when he was old.
I am accustomed to leave a seat beside me, I still believed he will come.
Everything became has become boring/dull/colourless/insipid.

* 'impossible'  in this context would mean that his behaviour is frustrating, or makes life difficult for you, rather than the situation itself being impossible