What does it mean when a guy says that he wouldn't be able to keep himself in check next to me?

After returning from our first date, this guy texted me how he wanted to hug me, hold my hand and kiss me.. He even said that he wouldn't be able to keep himself in check when he'll be next to me.. What does that mean?
What does it mean when a guy says that he wouldn't be able to keep himself in check next to me?
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