DEAR ABBY: My youngest sister started dating a man and they quickly moved in together. Six months into their relationship she got pregnant and they got engaged. Their wedding is planned for this summer. Recently she discovered he has been video-chatting with someone he met online. He admitted to flirting, apologized and promised that was the end of it. I have a strong suspicion that there have been other “situations” my sister is unaware of. Should I express my concerns to her and suggest postponing the wedding? Or should I keep my gut feelings to myself? I’m afraid she will ...