I think I'd be more upset that my sister lied to me than the fact my husband slept with her before we were dating So it can be great when he shows an interest in spending time with them, however, if he wants to invite your sister everywhere then be careful. My little sister in particular REALLY liked him and when she started dating a guy that was rather similar to my ex we all held our breaths but it worked out in the end. Well a couple years back I started dating a loser, he was cocky and selfish and controlling. If you start to feel that your boyfriend has a crush on your sister, then you should take a close look at how he interacts with her especially in terms of gestures and body movement. Let it go, dear friend.
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So be very careful. Just be there for her and try not to say I told you so when they do hopefully break up. It can be funny once or twice, but if they are making a habit of it you need to set them straight.