What does “if it happens, it happens” mean about having a baby?

My boyfriend has talked about wanting to have a child of his own several times, however when I finally agreed he didn't have much to say, however the other day he then said "if it happens, it happens". From a male prospective what does this mean? Why would he be so serious and adamant on having a child with me to suddenly seeming like he doesn't want to? It is a very serious thing so maybe he isn't quite ready for that.

What does “if it happens, it happens” mean about having a baby?
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