Would you say that i was too "easy"?

Okk so me and this guy have been good friends for about three months before this situation went down... Also, he has a girlfriend(4 yrs, who he's been having problems with) so don't judge me on what i'm about to say (i already know, spare the lecture) ... anyways we got caught up in feelings for each other and started messing around.. for about 3-4 weeks we've hung a lot and kissed/ touched/ talked about "feelings" and stuff.. then one of those days it got a lil too heated, clothes came off, and i went down on him.. It's been a month since then and even tho we're still friends, it's been awkward and we don't do anything romantic/ual.. Part of it is me, but i also feel like he backed off.. i hate to ask but, is it because he got what he wanted and moved on? did he think i was fast/easy and lose interest? in your opinion.. was i too fast?