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Not sure about this, but I'll try...
Base pairing helps to keep the DNA molecule stable, as if the bases were exposed, and not paired inwards in the way they are, they would react with cellular fluids, which would cause the loss of the DNA information. Also, base pairing occurs with hydrogen bonding, and individual hydrogen bonds are easy to break (mind that many hydrogen bonds are strong, but few or individual can be broken easily), this helps when the DNA must split for DNA replication or protein synthesis.
I asked my teacher told me this-
Purines with prymidines, ocuppy same space between the backbone strands,space constant more stable
complementary base-pairing(ATCG,hydrogen bond)is crucial to for replication and gene expression.,DNA is semi-conservative