I think it's probably because of their goals. They might have thought,"I'll ask her out when this is all done."And maybe because they thought 爱情 can be a distraction to their work.Or maybe the boys have so much pride they think they're just gonna end up being dumped.Well, it wouldn't hurt to try right? How about 你 guys? What do 你 think? Now I wish Arakawa-san is 阅读 this. She doesn't know how many people would like to see Ed and Winry 或者 Roy and Riza kiss.I wish there was a psychologist in the series,so that way Winry 或者 Riza won't have a hard time thinking,"What do men want from women?" 或者 Roy 或者 Edward would think,"How am I supposed to impress her?"