If a guy only calls when driving?

Whenever I have something serious to talk about regarding emotions a guy only calls me when he’s driving. I find it disrespectful because his attention is obviously on the road and I can tell from his tone when his attention shifts. I mean he only calls once a week and randomly texts. But I feel if it’s something serious he should try to find some time at least one day in the week to talk for a bit not just a 10 min call. Am I fair to assume this?
If a guy only calls when driving?
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