Dating more than one guy at a time?????

Ok, I am somewhat seeing three different guys right now. One is kind of more of a convenient thing, another is more of just a ual thing (FWB) and the third guy...the most recent one...I am actually starting to like more than just a casual way. I am up front with all the guys that I am seeing. I tell them I don't want to be tied down right now....just got out of a very long relationship...so I am not ready to be exclusive. Anywho...I think the third guy is starting to really like me as well. I have more contact with him than I do with the other two. He is sweet, kind, genuine, honest, and don't forget gorgeous! But before I started having feelings for this guy..( but not overpowering...but can see them developing more in the future) I had made plans with my FWB guy for this week. Since I only been on 2 dates with the sweet guy and we have not had the "talk" only knew each other for a couple of weeks...will it be bad of me to keep the date with FWB? I also have a date with the sweet guy this weekend! So confused! Never been in this situation before...so I guess I don't know the etiquette of dating so to speak lol!!