Angiewr

We have a female budgie whonis nearly 2 who we had for about 7 months before getting another budgie which we found out is male. They were great for a while and then recently our female budgie has started attacking the male budgie - pulling at his feathers, pushing off perches and stopping him eat. We do not know what to do for the best. We have put her outside the cage but she goes to him and tries to get him through the bars. He on the other hands misses her and always goes yo where she is. Please help as we want to make sure they are both safe and that he doesnt get hurt. Many thanks