Sexual orientation is a personal and private aspect of an individual's identity, and it's essential to respect their privacy and boundaries. Jumping to conclusions about someone's sexual orientation based on the actions you described may not be accurate.
Regarding the situation with your boyfriend's friend sending him pictures of his body and asking for feedback, it's crucial to consider the context and the nature of their friendship. People have different ways of expressing themselves and their level of comfort with their bodies. Some individuals, regardless of sexual orientation, may feel the need to seek validation or feedback from close friends, regardless of gender.
Rather than assuming someone's sexual orientation based on their behavior, it's more important to focus on open communication with your boyfriend. If something makes you uncomfortable or raises concerns, discuss it calmly and openly with him. It's essential to trust and communicate with your partner to build a strong and healthy relationship.
Remember that friendship is based on trust, and your boyfriend's relationship with his best friend is separate from your romantic relationship. If you feel insecure or uncertain, share your feelings with your boyfriend, and address any concerns you have together. Building trust and understanding in a relationship is key to maintaining a strong bond.