If two love birds were in the same cage and the male bird escaped will it come back to the female b?

Maybe. Put a spare cage right next door with the door open and some food and water in it. Keep an eye out. With some luck he may fly in to try get to his mate and you can slide the door shut and catch him. (Tie string it and pull it to out some distance between you) worked for me once with a lovebird! Good luck!