why is he acting like this????

hi, 2nd time uploading this. so, im a new member of my school's robotics team (btw im a girl). i've joined the programming department, and i keep catching the head of the department staring at me. like, ill be working on soldering with my friends and ill see him staring at me in my peripheral, but when i turn my head to face him, he'll just quickly turn his head and walk away. ive seen him do this multiple times. like COME ON BUDDY. I CAN SEE YOU??? he'll also just join me and friends' convos and randomly exit out. he'll stop talking in the middle of his sentence and robotically walk away like hes a sims character. wtf bro? idek atp, i'm curious why he does this, but im too chicken to actually confront him, bc im kinda into him (he is pretty hot ngl). is he just socially awkward? any thoughts, advice, whatever is very much appreciated :)))