Be more open and stop trying to regain their "friendship", even if you do it's not going to be genuine and they're probably just going to be using you so it would be a complete waste of time. If I'm bored of my group of friends for a day I just go up to a random group of people (who don't look like complete douchebags) and begin talking to them. If that doesn't work, just try to communicate more with other people, try to find interests that you have in common and build upon that.