I think my boyfriend is cheating on me with my sister!!!!

Me and my boyfriend have been together for 2 years. Recently I have suspected that he is cheating on me and worst of all with my sister who is 1 year younger then me. I am horrified of this thought and I can't eat or sleep and I'm going into depression, They are always giving each other eyes and smiling. She is always on the phone and when I ask who she say's it just a friend and she keeps her phone as secure as ever away from me as she previously didn't and he also does the same thing. They also now all of a sudden do overtime at work on the same days. And me and my boyfriend haven't had sex in in over 2 months. He also comments on how I should be more like her and compares me to her a lot when we fight. I need some advice, what should I do? Could my own Sister do this? Please help :(
Updates:
+1 y
I know it's been a while since I have responded to your answers I am sorry I have had so much going on. But since then a lot has happened and unfortunately you were all right. The lying and low life EX boyfriend now did cheat on me and YES it was with -->
+1 y
so called SISTER...And NO they didn't have the decency to be upfront and tell me! My suspicions were confirmed as I saw sick text messages from one another on my so called SISTERS Mobile phone..I still feel hurt and betrayed!
+1 y
I also would like to say a HUGE thank you to everyone who answered and commented I did read your all your answers at the time they were posted but it wasn't until I found out about 2 weeks ago that I had the courage and energy to respond and update-->
+1 y
as I am still very hurt. It's nice to know there is still good people out there who can take the time to respond to a strangers cry for help..Thank you all any further questions you have don't hesitate to ask.. :)
I think my boyfriend is cheating on me with my sister!!!!
22
28
Add Opinion