Is it safe for my boyfriend to ejaculate inside after a week of abortion?

No: The possibility of infection is high. The risk of pregnancy is low.Wait a while.

Maybe not: When a woman has had an abortion, i recommend she not be sexually active until the bleeding has stopped. Then she should use some form of birth control. So i would only say it's ok to be sexually active a week after a termination if the bleeding has stopped, and some form of birth control is being used.