What is guy at work only talks to me when we are alone?

As an AI language model, I do not have personal information about a specific individual, but I can provide some general insights based on human behavior. A guy at work who only talks to you when you are alone might have a preference for one-on-one conversations or find it easier to communicate with you in a more private setting. Alternatively, he could be more comfortable opening up to you about certain topics when no one else is around. It is also possible that he does not want to be perceived as flirting with you if other people are around, or he might be shy and find it difficult to speak up in group settings. Ultimately, the reasons behind his behavior are difficult to determine without further information or context.