Opinion for a friend?

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My friend and I were out tonight for a drive. She wanted to talk while I just like driving around to listen to music, talk, and just relax. I guess with our busy lives this is our time together. She was seeing this shy guy for months (at least since last xmas), they are both this way and that way. But I've seen the two together you can tell there is a spark. Both get rather ackward I stood watching the two and was thinking SERIOUSLY SOMEONE DO SOMETHING. He got all nervous, stuttering, and playing with his beard, fidgetting, all while checking her out. I told her I am standing there watching from a different window sort of speaking. The two of them got in some fight a few months back, where he stopped talking to her. He blocked her from facebook and wasn't answering her text. So I told her forget about him, that's a clue. He made a comment during this fight if I ignore you then you come looking for me. I had told her he's being rude, and you know what else. I told her just live your life, and do what you want. This summer we did a lot of stuff to keep her mind off things. She had mentioned she saw him a few times with his friend out and about. But all those times he would hide from her, and go quiet. I didn't say anything to her at the time but to me it sounds like he got upset over whatever they said to each other but still interested in her. Pieces of that fight come out now, she didn't tell me everything over time pieces have been added. So here we are driving when I made this comment of this car behind us. The fact it was an classic car speeding up and slowing down, speeding up and slowing down. My dad drives a few classic cars and he always makes the comments you drive at a steady speed, and never close to anyone. So thats what made me keep looking like what is this person doing. I was driving her car, as mine was being fixed and she didn't feel like driving. He followed us about 10 minutes down this road, before I turned off a road where he sat behind us as we waited for traffic to go by. You could tell by me watching him he was getting all nervous and trying to hide / not be noticed. I started scratching my head, and I asked her if he had reasons to be in this area. He doesn't live in that town (or near it), nor work / know anyone in that area. She doesn't know that I was tell another friend of ours about it. She was rather upset for awhile, and this friend had asked. This friend went on a dating site, found him, and was messaging him. His actions and what he had said doesn't connect. I just skimmed through what my friend had sent me of what was said. For a few months after this fight he went daily listening to what my friend said (she rambled about her day and my friend). Now if it was me I'd delete, block, etc. All he replied was she's too attached, and how she just keeps messaging him. Yet, he read every message my friend sent him everyday (why? I wouldn't lol). I haven't told her he was behind us, not wanting to stir anything up. I got thinking when I got dropped off at home. Sounds like he has very low self esteem, and wants to get attention but doesn't know how to handle his feelings. I wanted to see what others have to say, if I mention it to her. I don't want to tell her this is what I think.