I have an indoor cat....?

I've had him for a year. Hes the only indoor cat I've had I'm wondering is he happy. I can't and don't ever want to let him outside I live right by a busy street and I don't he'd come back if I let him out or find his way home but hes gets curious hes always looking out the window.... show more I've had him for a year. Hes the only indoor cat I've had I'm wondering is he happy. I can't and don't ever want to let him outside I live right by a busy street and I don't he'd come back if I let him out or find his way home but hes gets curious hes always looking out the window. I'm just worried. Do indoor cats like I don't know how to explain it are they used to it indoor cats can cope with staying inside their whole lives? I love him so so much and give him lots of attention it would scare me and worry me to death if he ever got outside.
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