Lesbian Love vs Opposite Sex love?

Can a women love her man partner and get to love another girl or start likeing another girl i mean ok it can be but do you think scientificily and psychologically be stronger than the love from opposite sex? Is a same sex relationship more pure than an opposite sex relation? or its just cause a girl has a lesbian friend and just coz she thinks she likes her etc she will get paranoid and confuses lust with love? Which one will prevail? i want a professional taught on this please:)