Annoyed ... Friend with benefit
My boyfriend and I have been together for almost 4 months now and things have been going great until I found something out the other day. I found out from a very reliable source that another girl who is a friend of his had broken up with her boyfriend just as we'd been going out for about a month and had been hitting on my boyfriend quite a bit. Nothing happened between them, largely because he was going out with me but apparently she got a pretty strong message or impression that if things didn't work out between us then she'd be his friend with a benefit.
I'm fairly sure that nothing's happened between them since the main thrust of the story was that she was dissappointed by the fact that my boyfriend was pretty much avoiding her as much as he could but i'm a bit annoyed that my boyfriend began setting himself up for an easy landing if things didn't work out while we were going out.
What should I do - i'm start to get a bit paranoid and feel like I can't trust him. Should this be a dumpable offence?