It can also be seen from this aspect that you love your boyfriend very much and care very much.
So you're angry that he went to that occasion. Judging from your tone, you need to cut it. Be rational. You can tell your boyfriend why you don't let him go and why you are so worried.
I think you are like his big brother. You can solve this problem.
You should be warmer. Girls show your most attractive side. Men sometimes need training. The gentler you are, the more he loves you.
You are so tough, it is normal for people to leave.
Usually you can help him massage and learn health care knowledge, which is good for you and you have the idea of going home at once.
I hope my answer is helpful to you.
Become smaller and more feminine, and have more happiness and love.