Help me. Please give me advice?

There's three guys that me and my best friend are involved with. My best friend's name is Lissa. And three guys' names are Anthony, Sebastian, and Fernando. (Note: All these names are fake. I don't wanna say their names on the internet...) From the beginning, me and Lissa were kind of like spies. The asf (anthony, sebastian, and fernando) would always go walking around the school campus during lunch. (It's a small school) Me and Lissa thought that they would go around just to see Elaine. A girl Fernando might've had history with. But it turned out it wasnt the reason why. The relationship between me and lissa with the asf was weird. There were many situations that made me and lissa cry and the asf getting annoyed by. When they finally got tired, they told me and lissa to never talk to them ever again. But whats weird was that when they told us that, we didnt have a situation we were talking about. It's like the 1st day theyre talking to me all happy and the next day, theyre angry for some reason. They wont even tell me the real reason why. Now at school, they keep on starring at me and lissa! Its wayyy too uncomfortable...>__< Id say sorry for no reason but if i did that, it would be the 17th time. they really know how to hold a grudge!!! What should i do?