boyfriend doesn't show affection anymore

we been dating for 2 years and 6 months now.. he's been changing ... Doesn't cuddle with me. just a lazy dude. I want sex, and love . Sometimes i even think about cheating on him , but i won't because i'm not a fucked up person but i do think about it. also, this girl i work with, i feel a sexual connection , think she likes me but i don't know if i'm lesbian because i like dick. but sometimes i wonder if i should be bi too .. I don't think he finds me attractive anymore. Not even in bed or when we go out. ugh idk im confused and depressed. what should i do. im going crazy