All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Being attracted to women and not to men is contrary to the Fitrah (natural predisposition upon which Allah created mankind), and it is a kind of affliction.
You have done well by striving not to fall into what Allah, Blessed and Exalted be He, has forbidden, and by seeking to earn His Pleasure; this is how a believing woman should be.
You must strive to get rid of this feeling by seeking the Help of Allah, and supplicating Him frequently to rid you of this evil feeling, as Allah is capable of everything, and the hearts of the people are in His Hand and He turns them as He pleases.
You should also be keen to get married and feel that it is the way that Allah Almighty has prescribed for chastity as well as the many other Islamic benefits that result from it, such as offspring and the like, in addition to feeling the ugliness of sexual perversion and its bad consequences in this worldly life and in the Hereafter.
Being attracted to women is not an Islamic impediment for allowing your husband to marry more than one wife. Just having this inclination [that you mentioned] does not prevent from sitting with them like all other women if you are secure from temptation, and you should avoid sitting with them if you fear temptation.
In any case, you do not have to tell your husband about this feeling anyway, whether he wants to marry another woman or not.
Allah knows best.