There seem to be several aspects of all this that concern you. There's the issue of how to deal with him. First step, consider what is this relationship about? Do you want this to continue? Do you want this to decrease, or to stop completely? Altho, you have also described addiction. Yet, you feel manipulated - so perhaps spend more thought and time in consideration of this - the various ways that this has happened, and what some options would be for you, to avoid repeating the pattern, or to sooner recognize when it's happening, or to be certain that it is manipulation. With addiction (you've mentioned computer, and this relationship) - you could set limits on your behaviour, or decrease, or stop, or find substitutes. Thing is - do you want these to continue? You have the power to decide and to control what happens. If you want this relationship to fade, you can do that. Just allow more time pauses (eg. your responses, that is, don't respond right away). From your description, it sounds like he flirts a lot, so this is something that's important to recognize and acknowledge (is this likely to change?).