I kinda like this guy, and he is a psychologist.?

I know it sounds stupid but I found myself liking this guy and he is a psychologist, do you think he knows that I am interested/like in him? I think he kinda knows it but then I tried so hard to just act like I don't like him by not looking at him, act like I don't even know he is there, not talking to him, did not put on make up, dress up as simple as I can, just so he might think that I am not interested in him, the reason why I doesn't want him to know I am interested in him is because I found out that he got a girlfriend, and I don't want to be a spoiler...Do you think he will notice that I m interested in him,??

Thanks for helping. =)