How can I talk to this girl?

(I made this post in another community and I didn't get an answer, So that's why I am posting it here.)

Hi so how can I start this long story, I met a girl at my college at the start of december, Besides her looks she was really nice and attentive towards me, I had feelings for her that day when she asked how things were going for me out of nowhere when she didn't even know who I was, At first before I approached her I only wanted to know her name I thought she was too good for me and that I wouldn't be able to talk to her, But we had a good conversation and I decided to ask for her instagram, She said she had instagram deactivated, I then asked for her number where she declined saying that she doesn't give numbers out to everyone, I respected her answer and said sure she also added that we will be seeing each other in college so I was still happy.

A month passed, And we had small talks before The month passed, Nothing serious didn't attempt to try to get her social media, Didn't try hard to get her attention just normal talks.

Suddenly one day she sees me and we have a good talk and out of nowhere she decides to give me her phone number, But plot twist It's actually her house number not her phone's, I didn't have a second thought about it because it seemed suspicious I was just too focused on her, Thinking in my head (I don't want to make her feel like she is suspicious, Because then I think she won't give me the number at all so a house number is better than nothing.)

I didn't take responsibility for my boundaries and didn't say anything because I didn't want to lose a girl like her,

so I take the number and guess what I call and nobody picks it up and fun fact it actually was never a house number it was a number of a guy. She did say prior before I made the call that she was very interested to know what would've happend, Which was very suspicious, But still I didn't say anything because like I said I didn't want to lose a girl like her.

Last time I saw her was at a college party before the 2 week break from college, And that's after the events where she gave me the phone number of this "guy". She looked at me smiled like nothing had happened I looked at her face angry sad feeling like I got manipulated, I left the college during that day and went on a 2 week break.

Now 2 weeks has passed and I haven't seen her up until 3 days ago she was getting on the same bus as me, I was also with my colleague, When I told him about the entire story, he said just forget about it, I ignored her went my way angry disappointed sad.

Now it's today, The time I am making this post, We had math and the girls come In the same room where we were studying, And she also came in the room,

She said hi to me and smiled I said hi back but I was still mad angry disappointed sad more angry actually than ever, Then I just continued my day but the feelings still didn't went away.

Summary : I have feelings for this girl but she did something to me that made think about myself and her more than ever (by myself I mean to not trust everyone and respect my boundaries), I don't know what to do I want to go talk to her tell her why she did all this when I only had respect and honesty with her, And that's what I am asking, An advice, if my talking will help me in any way rather than damage me.

Thats it for me thanks for reading this all the way through I only want an advice for what's the best for me and for her I just simply can't stand her Hello's or smiles anymore. I am 17 and she is 18.i