Mixed signals...

One of my close guy friends and I had been cuddling last semester and I know we shouldn’t have because he has a gf but we did. We stopped because word got back to her and they had a fight. It happened like 3–4 times. Still more than it should have, but not as bad as it could have been. Honestly, stopping was the right thing to do. Today, I moved back into school. He helped me with my stuff. All of a sudden the no cuddle rule was gone. Our faces were super close. There was tension. He laid on top of me multiple times. There was A LOT of tickling. And he told his gf that he was with two of our mutual friends that are guys. I asked him about it and he said he was just tired. But it sounded like he was trying to convince himself. I don’t want to be the person to break them up. Any advice?