Why does tom become insecure in chapter 7

The Great Gatsby Summary and Analysis of Chapter 7 ... Tom, unsettled, goes inside to get a drink, and in his absence Nick remarks that Daisy has an ... Tom is profoundly insecure, obsessed with both his own inevitable

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Tom realizes Gatsby and Daisy had an affair after a conversation exchange. Tom witnesses Daisy and Gatsby's "You always look so cool." and "She told him that she loved him and Tom saw."

it also couldve been that the girl (myrtle) Tom was having an affair with was involved in a hit and run and died. that was the first time he ever cried.

he will find out what went wrong or happened and how.