I need advice asap!

Martha • Married to the loml 💗🔒 XI.V.MMXV 👪❤
I feel so guilty right now so please, someone give me advice! Today, I ditched school because my best friend got suspended so I decided to stay with him. My boyfriend thinks I went to school. So I was at my bffs house and he had a red sharpie. He wanted to write on my face so we were wrestling for the marker. When we were wrestling, his face was so close to mine, I tried to look away as much as I could had but he leaned in to kiss me. After the kiss, I tried to act cool but like deep inside I felt so guilty cause my boyfriend came into my mind. Idk if I should tell my boyfriend or just keep this to myself. Someone help me!