Is this love, loneliness, confusion or what?

I met a woman long time ago, it was a friendship only. She had a bf at that time. However, she started to show interest in me after one year. Our connection was out of this world, we deeply care for each other. When I go through something I can see sadness in her eyes that I never seen before, she encouraged me to follow my goals and shared them with me, she genuinely cared about me. I cared about her too, I did things for her to show her my care, like getting her coffee after she had a long day, or helping her with daily things to make her day easier. It was a purely selfless connection.

However, my life changed since the end of last year. I do not look at people the same, I do not feel the same about my family and friends. Except her I still trust her, she is the only one right now that never betrayed me in my life.

I did not speak to her for a long time, I started to have those romantic feelings for her, its annoying like when I see couples outside I think of her and what would it be like if we were together.

I feel bad that I developed those feelings. Because what if she is only sees me as a friend. The other thing is I am nor sure if my feelings are genuine to her or just because of how my life changed dramatically and I feel lonely and all other connections I had in my life fell apart and she is the only one in my life who is still standing.

I do not know what is this?