The whole band has admitted to being Bisexual, but mike is just a bit 더 많이 shy about admitting it, thats why 당신 never really see 또는 hear any thing about it.
I saw a picture on 구글 이미지 of mike 키싱 Billie sooo he must be bi but it could be 사진 shoped 또는 something my gusse is that he's bi no problem with that tho