Idk... it's hard for me

So today my SO is hanging out with a few friends he hasn't seen in a while. He told me he would messsge me when he could because im clingy and like to talk to him all the time. I know i shouldn't be this way...i should give him space but it makes me have a breakdown when I'm alone for a long period of time. I ask him what time his friends are leaving so i can talk to him. He first said around 5-6. Then at around 6, he told me they were going to watch a movie and after the movie. He then changed it to 10 after the movie was over. I know i dont have a right to be upset but i would like everyone's opinion on this...