Because you are now married, you cannot be claimed as a dependent on his 2002 return. Prior to your marriage, you can be claimed as a dependent if you meet all 5 dependency tests.
1. You were a resident of the US, Canada, or Mexico, or a US citizen. (You're a US resident for tax purposes if you were in the US for more than 1/2 the year. The test is actually more complicated, but since you've lived here the whole time, you can just say yes & move on.)
2. He provided more than 1/2 your support.
3. Your gross income was less than the personal exemption amount ($2500 - $2900).
4. You lived in his household the entire year.
5. You are not filing a joint return with anyone else.
Since you had no income & lived with him for 7 years, you'll pass all 5 tests. He can amend 1999-2001 and claim you as a dependent for those years.