If my boyfriend is a green card holder, how can he petition me to go to the US?

He can only petition for you if you are officially and legally his wife. He can only legally marry you if his previous marriage is terminated, through death or divorce.

Make sure he files for divorce and then you can marry. He has to file an I130 petition.

No, your boyfriend can't petition for you. You would need to be married first.

If I understood you correctly, you two are planning on getting married, right? If not, you may disregard the remainder of my reply because there is nothing he can do to get you an immigrant visa. If you two want to get married, you two have two options: 1. He would have to travel to your home country, marry you there, and then he could petition for you and your child. 2. Alternatively, if he qualifies and wishes to become a US citizen, he could invite you as his fiance after he becomes a US citizen. (Being a green card holder, he cannot bring in a fiance, unfortunately, so option #1 is not available to him right now). Important: Regardless of what you two decide to do, he must obtain a divorce decree from his first marriage. If his wife abandoned him but divorce was never filed, he is still legally married to her and cannot marry you under either of these scenarios. So it is important that he gets his divorce. It should not be a problem though, since the wife left him such a long time ago, but he would have to go through the steps to get that divorce decree before he can think of marrying you.

You will need to marry him before he can file an immigrant visa petition for you. make sure he is in single status.