So you wanna be Casual Friends?

This guy I used to date wrote me this after I wrote him... Guys what does this mean? What is a causal friend thing? I am the type of girl that usually has boyfriends. He wrote me a 3 paragraph email and this is the end of the email. Before that he writes how he should have called me and how he was having family problems and a business trip and says he is trying to not make excuses? Advice please I need it- what does "casual friends" mean?

"I'm not trying to make excuses. I just wanted to explain to you what's been going on. I'm sorry I hurt you... at least that's how I read your email. I probably should have let you know what was going on, but to be honest we'd only been out a couple of times and I wasn't sure how things were going. After the last time we were out I felt like this was more of a casual friend thing. Obviously you felt differently than I did about the situation and I'm sorry that I didn't pick up on that. If you want to talk I'd much rather do it on the phone than here on email. If you can wait till I get my phone back I'll give you a call and we can talk or if you'd rather I didn't I can understand that too."

So you wanna be Casual Friends?
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