What should I do about my situation?

So theres a guy at my school (i'm bisexual btw) & in one class,we sit next to each other. later on,i lightly touched his elbow against mine,& eventually,i ended up getting turned on! Later,i ended up putting my hand on his arm & got turned on even more! later,i even put my hand on his knee,& he never said anything either. i assume for him to be straight (& i only like guys physically and girls physically & emotionally),but later on i realized i ejaculated in my undergarments from the arousal! i was alittle embarassed,but didnt regret it. should i continue this behavior,since its not really hurting anyone?