Twin help! I date this guy but i like his brother a bit too but his brother REALLY likes me! What do i do?

Im dating this guy called Raphael but his brother tag fancies me as well, he is always texting me, IM-ing me saying 'i love you' or 'be with me instead' honestly, i love rafe but rafe has been really distant lately, what should i do? especially when im falling for tag more each day