Hi, speaking as a pakistani girl i dont think he will ever not commit to you. As you said yourself, it has only been 4 months so i think its abit too early to start thinking so far ahead in to the future.
He will be reluctant to introduce you to his parents becuse it is so early on yet. I would give it time. I have been with my bf for 10 months and wouldnt dream of telling my family yet until i am 100% sure that this is what i want.
You are coming from two separate cultures and with our culture if we want to date, and especially marry, then we have to be sure that that person is worth taking the 'risk' for or else we face being disowned by our family due to the embarrasment they will face in society.
I would give it time but just ask him about how he sees the future. x