guy friend problems 😁

my guy friend had a gf but she would give him what he wanted... if you know what I mean 😏. and he thought my best friend would do it so he started texting my best friend. he eventually broke up with his gf to get with my best friend but she wasn't interested. so now he's asking me. HELP? what should I do?? he tells me that he feels bad for breaking up with his gf for nothing, so if I do it with him he will feel better about himself. any advice?