Im confused whether he really likes me and if its a bad idea to take things further?

Hi I am a psychologist so I am going to answer your questions as directly as possible. I believe you are curious and I believe he is as well. There is nothing wrong with experimentation. If you are comfortable with experimenting I would suggest , in other words basically what you were doing before. You need to be in a quiet place where you will not be disturbed and really focus on what you are doing. If something feels wrong about it then stop. I do believe you need to sit down together and speak very openly and honestly with one another. Your age suggests to me that this is curiosity so I wouldn't suggest jumping into bed right away but when the time is right. Wear protection as well gay males are at very high risk of AIDS and STD's I realize this is your first time and he has a girlfriend and you don't know where his girl has been, even at her age. Good luck and please remember experimentation DOES NOT make you gay, it makes you curious. If you are gay, you probably already have had feelings for other boys in the past. I hope things work out for you, if you have any other questions please feel free to ask me.