I would carefully word it if you are going to tell him. That you are strongly attached or something. I would NOT tell him about the drive bys or lookups on myspace. (Contrary to probably what some on this site might believe, I don't think it's absolutely necessary to confess all...at least not to him. He could get freaked out by it and then there goes the relationship.) Especially if you are aware it's a passing phase and do not wish to harm or get closer to him. Legally yes it is "stalking". If you feel it escalating then you might want to try some meds or something and look into further help for these feelings.

If you can keep this obsession in check and try to work it out by just giving it time to fade, or talk to another T about it (that you wouldn't feel you'd get attached to), or realize it's part of a phase of attachment that some people get then you might be able to deal with it better. I've done the same things you did in the past ! All of it! But don't feel the need anymore I think you'll get to that point too.