Could this lead to something else

Can FWB become more? We talk everyday, he always calls me if something is wrong. His friends really like me, on occasion we'll hang out with them. He takes me out to breakfast, lunch or dinner. I sleep over his house, sometimes week long periods. Is he just being nice or could it be something else? We meet in October then he left for a job and we recently reconnected about three months ago after being a part for 5.