ive watched tons and tons of anime and my fav ones with a great story and with great endings are ones that are popular with others to
so i recommend you give them a try:
Onegai Twins, Hajime No Ippo (not excatly a love story, but the character has love for what he does and that is boxing. Best anime amoung all animes that exist... why do people not watch it or why does it take so much effort to get them to? Because its about boxing. I can already picture you in your home thinking im not gonna watch this or i dont like sound of it. Trust me... try it) , Hanbun no Tsuki ga Noboru Sora, Zero no Tsukaima.