Is she being uncomfortable around me !?

Long story short

I met this girl from my workplace and I liked her very much , I was crazy about her but we didn't talk to much and out of nowhere she left and she just got stuck in my head

So I started a new career and guess what... 6 months later she just got into the same career like mine and we chat a little bit at the begging like 2 times but for some reason she is being weird or uncomfortable like the conversation feels forced now and I just don't know why and it's making me feel uncomfortable as well and i don't know what to do , I'm thinking of just not talk to her anymore even if it's hard to

He met in my other class a friend of mine and now they're good friends and it made me feel a little bit jealous ( she's even helping him with his Instagram business )

I met a group of girls who I used to talk to but now they're all serious and they just give me a quick smile and my intuition says it's something related to her

I met someone else that I really like , she treats me well, have good positive energy and I feel good with this woman but for some reason I steel thinking about her and I need her to get her out of my head but I will still seeing her around campus