What should I do? ?

This is my boyfriend and I think he may be cheating with my sister and I'm scared that they have something together she's 16 and he's 18 and I'm 21 so it's easy for them to have a thing I'm just really scared I love him but he's been spending a lot of time with my sister and stuff and they go out to parties together that's my boyfriend, my sister, then me
What should I do?? <br />?
What should I do?? <br />?
What should I do?? <br />?
What should I do? ?
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