It's possible to love someone (like a friend, for example) without being in love with them romantically, and that's what I think is the case here.

She made ​​it clear that loves to be willing to die to catch it, but not a sexual attraction with love, more love, family.

^But the question asks "in love" which means a sexual and romantic love.

Well if you remember that old saying "love is friendship set on fire" its not impossible for it to be both.

I didn't say it was impossible. I'm just saying that, as it looks to me, Faith sees Angel as a friend, not as someone she's romantically in love with.

Also, saying "after all he's done for her" - doesn't it normally not work that way? You don't consciously choose to fall in love with someone because of what they've done or how they've treated you.

well thats the thing. Faith just could have ran away and not let him help her like she did with everyone else but she stayed.so its possible that she had some feelings for him to begin with because if not she probly would have run away from him like she did everyone else.

She did run away in BTVS. In Angel, Wolfram & Hart had hired her to try to kill Angel, and she went along with it (and tortured Wesley) because she wanted him to kill her and believed he'd need self-defence to drive him to do so. Her words at the end of Five By Five made that clear. It was his shared experience of having killed people and knowing what it was like to regret that which made him get through to her, not any emotions.

You dont need to explain the storyline to me i have watched all the episodes of angel and buffy many many many times. now regarding the question in season 4 of Angel when faith comes back she says that Angel is the only one to never give up on her and she is not going to give up on him. now that means that she feels some sort of emotion for him weather it be gladitude,devotion,love who know maybe even she does not know what she feels for him yet but she does feel something for him or she would have kicked him to the curb long ago.

Or it could mean that she wants to repay a debt for him helping her/not giving up on her. And gratitude doesn't equal romantic love.

never said it did. but i dont like arguing about this we just have different opinionss but i will say this no one knows faith true feeling for Angel but faith(or Joss whedon if you want to get technical).

True. People even sometimes argue about things the characters spelled out verbally, so for something you actually have to interpret there's no chance.

I don't know about love, but I knew she felt a strong gratitude towards him.

It's possible. She probably wouldn't be up front about it though.

I do not think she is "in love" with him, but she truly looks up to him.
She loves him like a true friend.

^That's how I see it.