Long story short, i have a girl of my dreams that i truly liked from highschool, and i met her today in college. It was obvious that we liked each other in highschool but I never told her i liked her in "a girlfriend way".

We haven't spoken since 2016 because i messed up something softly (meaning it's not really a big deal).

It was her birthday 3 days ago (she turned 21) and i didn't wish her a happy bday. SHE was the one who saw ME today and came up to me to say hi and we both kissed each other in the cheek. She was really happy to see me and I was also (in shock) really happy to see her.

My legs started to tremble unconsciously (i still dont understand why), i could barely control it but managed to make it unnoticeable, because i wasnt expecting this.

When we met today after so long, i went to the class in college with my friends and I couldn't focus on what the professor was saying for 3 hours... I tried, i tried SO hard to focus but you simply can not fight the emotions... all my mind was thinking about, was her... 3 hours have passed like 3 seconds...

My question

Should I take her out on a coffee, wish her a late happy bday, have a talk on what's new between 2016-today, and at the end tell her how I feel about her? By that I mean, i just want to let her know that i loved her and i have feelings for her. I'm not trying to get anything in return from her, I'm not a pervert or anything, I'm not gonna ask her to be my girlfriend (but that'd be more than half of my dreams come true), all I want to do is tell her how I feel. thats it.

Now before you start scrolling down to comment "find someone else and move on", hear me out:

Since the day I met her in highschool, I had fallen in love. Ever since then, i have not met a single girl that i had strong emotional feelings towards, other than the one i met in highschool.

In early 2016 since she got mad at me, in desperate hope to stay strong, leave her alone and move on with my life, no matter how hard i tried, i had at least 300 dreams how i fixed the situation and told her how i feel, but when i woke up and realized it was a dream, i got depressed for almost the whole day. Also, whenever I went out in the city (to college or where ever), I kept "hallucinating" that every 3rd girl i walk by, has the face of the girl i met in highschool. I can't get her out of my mind for 2 (two), years...

The reason why i didn't tell her sooner is an extremely long and complicated story. In essence, my enormous ambitions have prevented me from telling her sooner.

What could be the scenario(s) if I tell her that I like her and have feelings towards her?

Put yourself in my situation, and tell me - what would You do?