attracted to women but i have bf

hi! me (18) and my bf (19) have been together for 2 years. i know this sounds terrible…but i have always kind of wondered what it would be like to be with a women. my bf has been my first and only everything…i just find women so attractive and tbh the only man i even find attractive is my boyfriend, he has very feminine features. i dont know what to do bc i love my boyfriend so much and i dont want to do anything drastic if this is just some weird fantasy of mine ? has anyone else in a relationship with a male ever had this strong urge to be with a women before ? it’s just been getting worse and worse as time goes on so ignoring it isn’t working 😅😅 please give advice if you have it !!😭