So yesterday I was at a party and a situation still bothers me, I was wondering how others would deal with it. Basically I knew none of the women and few of the men on a superficial level. I was in a conversation with my boyfriend and a female. My boyfriend excuses himself, the female also walks away. I'm left standing, so look around and there's someone I can approach, I ask her how she knows the host and she replies that she's the girlfriend of let's say Joe. Now Joe and my boyfriend have been meeting a lot lately, so I'm happy to meet her and start talking to her. But she's holding a birthday card, she walks away to hand over the card to someone else. I was expecting her to return to continue the conversation, but that doesn't happen. Ok, alone again, I look around and there are four women standing close by, but they're talking one-on-one. I turn to them in the hope to join the conversation, but I can't make out what they're talking about and figure they're friends and probably don't want me to join their private conversation. I didn't feel there was anyone in the room I could connect with, so go and find my boyfriend to have a conduit for conversation. I felt pretty bad though and was wondering whether I should have connected to those women. I already congratulated everyone/introduced myself to everyone in the room, so I couldn't use that to break the conversation. Do other people break into one-on-one conversations of strangers at parties (and how?) or is that better not done?