Relax. All too soon. And indeed it a question if you have to fill in a tax declaration as you probably be exempt. Once it is clear you see your answer everywhere on the net.
You not give enough detail. The nationality of your girl, can be a determinate factor. Philippine stay here with bf, or to work, and do all tricks to stay as long as possible.
You not mention age. From 50 years old, retirement is best. Even if your wife is not 50, she can get a following spouse visa. If your wife want a job as teacher, then as said go for that. Indeed avoid ED visa. Gives problems often if you travel back into the country.