jealousy or just abandonment issues? TW / VENTING

since this morning i saw something quite disapointing. my bestfriend is now friend with one of old best friend (still friend w/them but we dont talk a lot since a while). so my best friend (that were gonna call Justin) and my old best friend (that we're gonna call Bryan) have each other in their biography, "my lover" in Justin side and "salvation" in Bryan side. i know they're just friend but for no reason it hurt my feelings quite hard. i felt bad in a sec. like if i was becoming the "leftover" friend. i cried a lot this morning about this sadly. i really like Justin, but as friend but i dunno i feel really hurt. i have abandonment issues but i think it goes too far. i just feel bad. 

do someone know why i feel like this ?