history: I recently went out with friends to celebrate a friends engagement. My partner was not their and many of my engaged friends other friends were single, drunk and feeling lonely and rejected in the presences of our mutual friends happiness. Several of them made attempts to flirt with me and I was polite in conversation but always put a stop to anything that seemed inappropriate and made it clear I had a partner who I would stand by  I have no intention of cheating on my partner and I hope they know this. Its good you made that decision
current: I just hope that they realise that. I would hate for them to ever feel unsure or insecure. 
next: Who are they you are referring