don't touch my mama!

Hey, I've been lurking big time, but here I am, in visible text-- hello! I was wondering what you all would do about a kiddo who is very possessive of his mama. My son was all about B. when he was my friend, and he was positively stoked on him when he was the guy that did our neighbor's yard, but now that he's my boyfriend, eh..not so much love shown.
The relationship is new (~3 months), so I keep the dating and momming pretty seperate, but as with all people whose company I enjoy, he's filtering into my life outside of just planned-ahead "dates", which I was never that big on in the first place.
Ds likes B. pretty well, but he gets stressed when the dynamic between us feels romantic, I think. I don't make out with my boyfriend in front of my kid or anything like that, but any physical affection-- pecks, hugs, hand-holding, etc. -- are vehemently reprimanded by ds (2.5 years old). At some point or another, I'm pretty sure B. has been told "No talk to my mama!" and "no laughing!". Which is a lame situation. So, what should I do? Just wait it out? What do you think of the situation in general? I kind of try to talk to ds when B. isn't around about how he feels about it, and once or twice we've talked about how we hug all of our friends, and why no hugs for B.? But...that's all I got for now. This is the first boyfriend, really, that I've had since becoming a mama--I think it's the fact of boyfriendness that my son objects to, not the fact that this guy hugs his mom. A lot of my friends hug me-- Though I know the physical distance between B. and I is different than it is with people who I'm just friends with. Anyone been through this? Just thoughts from an outside perspective would be cool, I'm just a little baffled.

oh- in other news, ds stared preschool on monday! still working on the subsidy, etc, but so far it's going well-- he goes to the same place as brainy's F. hurrah!