Hi Genny and welcome back, firstly find out if he is still seeing this girl, you may have already mentioned it and i missed it in your post, but that would be my first priority,if not then keep talking chatty friendly talk with him, and go out with him as friends, if anything is going to develop it will in time, but one thing for sure don't let it become too complicated, you are both young, so enjoy life,and his friendship.