(19f) (16m)

im 19 female, i met my bf (16 male) online 2 years ago when i was 17, when we first talked he told me he was the same age as me (17 at the time), we were just friends at first but we started dating a year later after i turned 18, we dated for 3 months, i talked to his irl friend after these 3 months and she told me he is actually 15, i left him at the time because he has been bad to me and lied about his age for over a year and wasn’t planning on telling me the truth but 3 months later he came back and begged me to date him and pressured me so i agreed despite knowing his real age, because i felt pressured and because i have severe attachment issues which caused me to stay with horrible people in the past, we have been dating for 6 months now but i keep thinking about the age gap, he is now 16 and im 19, i don’t have the heart to leave him and he wouldn’t leave me either, he even tried to commit suicide when i left him once during these 6 months,i dont have any bad/weird intentions everyone i dated before has been older, i dont know what to do and if the age gap is wrong ,should i leave him or not?