He was not happy! He took off and attacked the dwarves on the Lonely Mountain and then stormed onto Lake Town and destroyed it, but was killed in the process.
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its what hes supposed to do. he's the burglar and he's supposed to steal the treasure from Smaug with the power of his ring.
He was the burglar, after all! He wanted something to take back to the dwarves, sort of like proof that he had found what they were after.
Though it seemed wise at the time Bilbo took the cup, it was actually very unwise, because a dragon can sense when a part of it's treasure is missing, and will not rest until it has killed the thief. This is what made Smaug aware of the dwarves' presence to begin with.
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He takes it upon himself to save the dwarves, multiple times (from the spiders and the elves most notably.)he was a hobbit who knew how to sneak around places without being seen
Bilbo said, talking to himself, "what have i got in my pocket?" (it was the Ring). Gollum thought it was a riddle and Bilbo decided to make it one. he gave Gollum three chances to guess and gollum lost after four. then gollum went "to get something" (it was the ring), and Bilbo thought he was abandoned and left with the ring on. Gollum thought Bilbo knew the way out and he wanted to follow him, realizing Bilbo had the ring. Bilbo saw Gollum racing towards the gate and followed him to safety.
Gandalf surprised Bilbo and he was foreshadowing the future