My friend Christian really likes this girl Nikki, shes pretty cute i have a thing for her myself. But anyways, he invited his best friend Eric over&Nikki. Christian went to go take out the trash&when he came inside Nikki&Eric were all cuddled up and making out. (She just broke up with her bf)&my friend Christian is really jealous&upset, he shows his appreciation for her and all but nice guys always finish last, ya know? what advice should i give him?