When someone has already gone on more than one date with the same person, in the UK it is assumed that the two people are in a relationship. For example, if someone goes on a date once a week, it tends to be with the same person. There is nothing wrong with having only one option and there is also nothing wrong with having many. Some like it, some hate it, some are indifferent to it. It does not mean you actually like the person. If there is no talk, it is assumed the two people are not in an exclusive relationship. On the other hand, parties in the UK tend to be an opportunity to meet someone new.
My boyfriend seems to like it just fine, as we've been together for over a year now.
It means that you are ready for the person you are interested to meet people who mean a lot to you. Either way both the Brits and Americans value the thoughts and opinions of their social circle. While in the US, just because you go on a date with someone it does not mean you are going to pursue a relationship with the person you are on a date with. It is the first one on one meeting between two people. And because of this, parties might not be a great place to meet potential love interests, because the openly single people tend to be few and far between. I reckon most have never given it much thought at all. This is usually considered arrogant, and being humble is much more appealing, even if you do have an impressive bank account.