or he's probably fukking with another girl.
my brother once told me told, "when a man had his first taste of p*ssy, he'll jump from one girl to another". think of it like wearing your old sneakers. once you wear your old sneakers for a certain amount of time, you would want to buy another new fresh clean pair of sneakers. yeah, my brother told me that. he told mi think of it like driving your 2000 BMW 3 Series, and you changed your car for a 2015 Lamborghini Aventador.
when was the last time you seen him? if it's more that 2-3 weeks....... yeah.....
or maybe he's busy with important things in his life.
you should talk to him.