i feel guilty for broke somebody's love.i took him away from

i feel guilty for broke somebody's love.i took him away from her,and i treated him badly.sometimes i really wonder,if i didn't do that before,should they be together and be happy?maybe i should let go the moment i knew there was other girl with him.maybe that's all my faults.i don't wanna loose him.and i don't meant to hurt anyone.now what i know is that,maybe someday i will not by his side,and he would no longer love me,but still there would be a place for her in his heart,maybe forever.guess i am doing the wrong thing all the time.it's all my fault.please,please forgive me.i love him ,really.