how do you know

how do you know if your in love with someone,love them,or just really care for them because I think I'm ready to break up with my boyfriend but I can't I have no family or friends he's really the only person I have an my dog I'm applying for disability because I have epilepsy I can't drive or work I have an okay life with him he takes care of me the thing is I just found out he gave me an STD that's why I'm ready I know I still care for him I'm just sad