Background:
Almost 6 months ago I met a great woman and she has a son, who just recently turned 7. His biological father is out of the picture, and essentially has been for his whole life.
I am 24 and I have no experience with children, other than having been one once.
It is also worth noting that our relationship right now is long-distance and I visit them every third weekend.
Question: I seem to have a number of challenges arising from my lack of "knowing" him, as well as what I'm guessing comes from his expectations on how he'd like to interact with me.
1) Rough Play - I'm not a very strong or physical person, but he seems to like to play-wrestle and I am considerably larger than him. It makes me nervous that I will accidentally hurt him, especially since the playing seems to escalate until basically I tell him to stop. At this point he doesn't stop, and then he gets in trouble for what we were just doing 5 minutes ago. Should I even play this way with him or how do I de-escalate the playing?
2) Attention, possibly jealousy? - Last time I visited I spent nearly the entire weekend playing with him (legos, dinosaurs, etc). Then I try spending one hour with his mom and he can't leave us alone. He doesn't like it when we spend time together without him. One example (which was amusing at the time), is when I'm playing with him, his mother may call for me - to do something or another. He tells me to wait there and goes and does what his mom wanted me to do. I think he believes I'll do whatever she wanted and then I won't come back. Admittedly, it may take me an extra minute so I can give her a smooch, but not more than a minute. At this point it isn't really a problem, but i get the feeling he's developing an expectation that I should spend all my time with him. I've watched some of his movies with him, and occasionally it shows the "perfect dad" (to a kid) and he does everything the kid wants. I'm worried his expectations may come from this.
I'm also wondering if there are other things I'm not even aware of that I should be looking out for, since I am becoming a part of his life and I have no prior experience with children. In particular, things to be aware of since I am coming into his life now (as opposed to when he was born). Any advice is appreciated.