I’m really upset 🙃😐

So my boyfriend and I made plans to go to dinner & a movie for vday. This would’ve been our first one together. That whole day he was acting really strange, texting very slowly which is unusual. My stomach wasn’t feeling well but I was still willing to go out. He also told me he made plans but suddenly he was pushing things further back, the whole day had already passed. I just said forget it. I’m just gonna stay in because I’m not well. He said okay feel better so easily. Since then he’s been texting me so dryly. I asked him why is he texting so weirdly & he said he needs some space. I don’t understand, we were fine and now you need space?? I’m really upset, this is my first time in a relationship ever and I wasn’t expecting anything for vday just wanted to literally spend time with him. We barely see each other in between work and school. I’m also pmsing but still I feel really emotional about his suddenly change in behavior. Sigh idek how to communicate how I’m feeling to him.