CRYING DURING SEX!!!!!!

yup. So I'm 16 and I've been sexually active with my bf for about 2 years. Recently I've been through a rocky patch with him. Two days ago him and I met and solved our problems and I felt 100% fine. My mood was back to normal and happy and hyper as usual for me. While having sex like 2 minutes into it I BURST out crying. I couldn't control it. I didn't even know how I was feeling. I just started crying so badly. What does this mean? Is it normal? Can someone please give me a really good explanation cause I think it made him feel really down as if it was his fault and I feel bad and yeah. Please and thank you