te quiero” has a wider meaning than “te amo”. amar is to love in a romantic(hormonal or whatever you want) way, whereas querer can be the love you have for your friends, your family but also for lovers. in fact, the 2 are quite differents i don’t know how you can’t live with the words for expressing this. there is many people that i love-quiero, but i don’t think i’ve ever loved-amado somebody