What am I suppose to do?

So me and this guy have been seeing each other for 5 months he said I love you after 2 months and now he's being distant... he hasn't messaged for four days straight and I haven't messaged either because the few days before that I messaged him first. Did he stop caring about me? Do I ever even cross his mind? Why do guys do this? He talked about future plans and how beautiful our babies eyes would look. What should I do? I want to give him space and not blow up his phone or something but this is killing me
What am I suppose to do?
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