I'm sorry to hear this, and I'm not really sure what to say. However, if the evidence is enough to make someone else suspicious, it might be enough that the person will understand why the suspicions are there. On the other hand, this is not necessarily a rational situation.

It's tough. But falling in love means risk, and I have to keep telling myself that people do recover from heartbreak, because if I don't believe that, then I might as well slit my wrists. So perhaps in the end, you have to decide what would be more satisfying to you - living in uncertainty and dismissing those fears, or knowing, one way or the other, but risk losing it. A big hug is about all I can offer, either way.