Breaking up with my boyfriend to come out as a lesbian

i'm coming to terms with being a lesbian and am breaking up with my boyfriend today or tomorrow :( ive always known i like girls. i have a long, complicated history of denying it, and at first i thought i was just a lesbian, but after all the bullying i switched schools and told everyone i was straight. i guess as a sort of middle ground i told myself i was bi, and ive dated only guys ever since (for the past 5 years). literally all of them were either abusive or just not nice people, but the last 3, including my current boyfriend, have been really great. it just hits a point where i realize i dont love them the way they love me, that i cant. its always when i start hanging out with more girls (im nervous around big groups and usually stick to my close friends) that i realize i just feel something for girls that i never have for guys. theres a different type of love that i feel for them, and im sexually attracted to them for real, not the weird uncomfortable way that i feel when i have sex with guys. i love my boyfriend but not in the way i should to be in a relationship with. we havent been dating too long but weve known and been interested in each other for a while. i really care about him, and although he knows ive been unsure of my sexuality for a while and hes alright with it, im just really nervous to tell him im officially not into guys. i know hell be sad. i dont blame him. i just hate hurting people i care about. i know this is the best thing for me, but its still scary, and my chest feels all tight and sick whenever i think about telling him. i guess im just looking for support.