He told me he likes me but he ignores me?

Ok so I work with a guy who thinks its awesome tht I like him because I'm cute and etc (his words) he told me that if I got him a phone he'd gladly text me. We texted one night straight on but haven't since, I don't get many texts from him and when I text him i normally don't get a reply. He always has a reason as to why he can't talk and then he won't. He says he likes me but he constantly ignores my texts and its getting to the point where I'm so depressed because he knows I'm crazy about him an he knows I care for him deeply, this is driving me crazy