My girlfriend was being very suspicious so I followed her, and now I have a huge problem

I need some advice guys. Recently my gf has been receiving too many calls during very odd hours of the night. She has also been coming home very late saying that she was at a team building meeting at work. I called her boss, and he said they've not had any such meeting for the past month. So yesterday when she said she was going for a team building meeting, I followed her on my motorbike after two blocks a guy stopped his car hugged her and opened his car door for her. I was watching all that from a distance so they wouldn't see me. When they finally drove off I tried to start my bike to follow them but it couldn't start. What could the problem be guys? The clutch ? Engine? Petrol? Plug? I'm so worried about my bike.

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^{Got banned from} r/relationship_advice ^{for this so thought I might as well post it here lmao}