Dating a widow

I've been dating this great guy who's been a widow for about 8 mths. We have been dating a little over 6mths. At first we would go out on dates and he would make plans...but now he just wants to hook up 3 times a week. I am absolutely in love with him. We have constant communication and talk every night for 2-3 hours of I'm not at his place. I told him a few months ago how I felt about him...his answer "I dont know what to tell you" Every time I try to pin him down on what we are...he just ignores the question. I've asked him if we are just fuck buddies or what? I'm his big secret...he wont tell any of his friends or family about me. Yet we are monogamous. I keep telling myself if I stick around, maybe he will love me eventually. But I just dont know...am I being crazy?!