Welcome to Aperture Science!

When your friend goes to be 'offline' when you are going to play with him theres only 2 thing to do.

1-Trying to add him again and if he deleted u but if he didnt unfriended u just relax.
2-If your friend was angry and goes to be offline and it says on his profile 'Send (playername) Friend Request'Just relax.Really,That works.Like that guy(not gonna give his name heson our group)deleted me 11 times.And added.