Hello Hazem, here to "favour" is a verb, meaning to prefer, to desire, to want. In this context, it it saying that by listening to unrealistic things in music, in songs, I am slowly changing and conditioning myself to favour (to prefer, to wish for, to expect) unrealistic expectations in my own life. Basically saying: by listening to unrealistic love songs, I am incorporating this thinking into my life and therefore it is making me to prefer/to desire/to expect unrealistic things also. I hope that this helps, as always my friend, feel free to ask for clarifications. Best of luck!

prefer give preference to ... hence ... favour X over Y prefer X above Y . He favoured simple answers. He favoured full answer even if somewhat windy. He taught himself to favour plain foods as sweet ones affected his teeth.