Why does my dog pee every time he sees me?

my dog zeke is 1 1/2 years old and every time i walk into the house he pees. it used to be whenever i would touch him he would pee but now it has goten so i only have to look at him when i get out of bed in the morning and he pees. he never pees for anyone else in my family just me. i mean its not like i beat him or yell at him, he just pees every time he sees me. he also looks nervous around me to. im like 17 years old and my mom tells me maybe he has like a crush on me or something because he i also very affectionate to me once he does his little squirt of urine. so what im asking is for some input on this whole situation.