It’s really hard to tell someone why you love him/her. You can think up of a lot of reasons—personality, looks, hobbies—and yet you would still find yourself mumbling to yourself that you can’t really explain it. I guess that’s normal. What are reasons anyway? I think love is when you would still be willing to stay with someone despite whatever bad behavior he/she has. And this one works both ways: if your partner still wants to stay with you even if you think you are the worst person in the entire universe, then I think he/she truly loves you.
But what the heck with this long explanation. When you love someone, you don’t need to come up with reasons; you just know deep down that you do. :D