Confused

For my job, I often work for a few months, complete the project and move on to another project with a whole new set of people. I rarely find myself attracted to anyone and before starting the job that I am currently on, a friend told me to keep an eye out for a guy that she'd worked with before and thought would be a good match for me. I was instantly attracted to him, but I'm also terribly shy and felt nervous around him.

I know I handled the whole thing wrong, but after a few nice, short conversations, I wrote him a quick email stating that he should let me know if he'd like to get a drink sometime. He wrote back saying he'd "love" to and asked me when. I said Friday, but he couldn't because he had family in town and that we should do it next week. I told him to let me know when. After that, nothing. He never mentioned anything for weeks.

I was working late one night with like 4 other people in the office including him. When he left, he said goodbye to everyone except me. I felt worried that I'd offended him or made him uncomfortable by asking him out to a drink, so I wrote him that I was sorry if I'd done anything to make him feel uncomfortable. He wrote back that he was sorry he made me worried, that I did nothing to offend him and he still wanted to get a drink, but he was very busy with work. This is true. The job can be very stressful at times with long hours and weekend work.

After that, I still heard nothing from him. My friend told me he has a hard rule about no dating while working. I just wanted to have a drink with him to get to know him better and be more comfortable around him at work since our jobs don't allow us to work at all together. However, I would be completely understanding if he'd said the drink would have to wait until after the project is completed because he's very busy (which would be the best way to avoid "seeing" someone while working). He's very nice, but I'm getting nothing from him.

I feel confused. Feels like he is interested because he said he'd "love" to get a drink and still wanted to, but then there is nothing. Is he just being nice?