Boyfriend of one year is asking for space. What should I do?

We don't live together or see each other every other day. I have a job that requires me to travel a lot but whenever I'm in town which is usually once or twice a week we spend time with each other. We text/call each other every day but we're not constantly on the phone with each other during the day he's at work and cannot use his phone in the office. Recently I started feeling that something was off and asked him what's going on and to my surprise he said he needed some space I was shocked and I was wondering why he didn't tell me earlier instead of acting like he doesn't care anymore. I'm pretty sad as I don't know where is this coming from and I don't know what to do and how to react
Boyfriend of one year is asking for space. What should I do?
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