Love cheated by me

I am dolly, i am 21yrs old, A girl loved me for past 4yrs but i dont have any affair on her.., i loved another girl for past two years, In my relationship there is a small understanding, so i broke with her, even after break up she loved me a lot, becaz the problem is on her side..,, after somedays i spoke to the girl who loved me for past 4yrs.., after few days it became a affair, i too in love to that girl just 2month . within the two month i understood that the girl was adamant and dominating, in such situation i am in thought of first love, but this girl blackmiled me to live with her.., i wont like her but i try to adopt myself, but at a certain situation i decided to leave her.. and i told to the first love about what all the shit happens. she forgive me and she accepted my love.., but the second love keep on blackmailing, we have stayed for two time but not in sex. just hugging and kissing. i am ready for medical check up also., becaz we dont have any sex..,, now i am joined with my first love, but the second love blackmailing me.. i do no what to do. plzzzz suggest some solution.