My suggestion would be to avoid getting physical with him, do things together to see if you can in fact be friends... and if he's interested in that, you can let things develop slowly. That way you can see if he just wants the benefits without the work in being together. I assume you haven't told him about the abuse when you were 15.... once you know he wants a relationship with him, that's when you would start to share more with him... don't divulge too much too early. Don't get too physical too fast. A lasting relationship depends upon trust and friendship and unfortunately that takes time to build.