How can you tell if a girl is using you?

Like the title states, I’m just curious. Been talking to this girl and I don’t know how to feel about it. We’re basically just friends. We talk everyday. Her best friend doesn’t like me being around her due to my age. She’s 10 years younger than me but we don’t care. She is 18.

I like her. I have tried to express my feelings towards her but never really got a clear answer. I have only known her for just over a month now. She minds her own business and doesn’t talk to many people but we clearly trust each other. Her best friend controls her life tho. She can’t go anywhere without tell her where she is and what she is doing. She is very attached to her. They got into an argument over me a few weeks back. She blocks me each time they hangout. She does tell me when she is going to see her tho. She does give me a heads up. I understand, doesn’t faze me.

There are times where I don’t reply on purpose and she double messages. She texted me saying “morning” just this morning. I didn’t reply to her message from the previous night. This is not the first time either.

When we hangout, we click. Almost as if I’ve known her all of my life. There is no awkwardness what so ever and we laugh at each other and taunt each other constantly.

She is not the type to hook up and mess around with men. She even told me so her self. I believe her.

You can clearly state that she is mature, wise and intelligent. She is also very independent. She has a strong personality.

Her best friend states that she is only talking to me because she needs help selling her car but I find that very hard to believe. I am a grown ass adult, I know when I am being used. This is not the case in this “situation-ship”.

I am basically going with the flow regardless of my expectations. I may be getting older and lonely most times but I am not desperate.

She does not like serious talk. You can just tell. That’s mainly due to the fact of her mother neglecting and mentally abusing her. She has shown me proof.

This girl is innocent and does not seem like an attention seeker or someone looking for “emotional support”. She shows me her phone and send me screenshots of her conversations with friends and family “without me asking”.

She avoids people a lot she even does it to me sometime but I completely understand. It’s her life, who am I to tell her what to do or tell her how to live her life.

Like I have mentioned prior; we click. We are very honest to each other. We both respect and value our friendship. We both care for one another.

I do not want to mess this up. I once texted her expressing my emotions towards her and she replied with “I know you started liking me too but I’m sorry I didn’t even try for that to happen, I was just being me” this was almost two weeks ago. I would like some insight from my friends over here at Reddit.

Thanks!