I feel like I'm crazy

A couple of weeks ago, I was on my lunch break and see this crowd of kids walking around outside on a tour. I was on my way back to my building when I see.. Him. We made eye contact for a good minute and he waves over to his friend that is now next to me. As we arrive to our building, he's walking in there with the kids and tells them to wait bc he has a "surprise" that's when he comes over and talks to my friend.. I just sit there staring at him LOL as he walks away we make eye contact again & my heart starts racing. After that I only ran into him one more time... this time in the parking lot where we just stood there and kept looking at each other but don't say word.

I've never felt this way before and I feel like such a creep, he's always on my mind even though I haven't talked to him once and it's scaring me. But for some reason I can see myself with Him and it feels right LOL am I just crazy? I'm the type of person that doesn't believe in love due to being in an abusive relationship. Has anyone else felt this before? Am I being childish?