I let my boyfriend live his life and let him do whatever he wants. But I don't know how to deal with it and accept it. Should I worry?

I understand you here, because I went through a similar situation. Of course it all depends on what we're talking about when "let him live his life" because that is too wide. However, there is no other way than to let others their space and accept that they are like plants, that need water, light, and space to grow. Let him do his own mistakes, grow from his own experience and, while at doing that, try to focus on your own well being, your own matters in life. We are ourselves with out circumstances, each one of us is the only one capable of living his/her own live because that is his/her own and only belong to him/her. Wherever your life and his meets, you should encounter each other and share those precious moments.

I'm a bit confused here, are you both on a break? Because if you are and didn't set any kind of boundaries/rules, then yes, your boyfriend can do whichever he pleases. However, since this is not the case, you don't need to necessarily worry. Although if something does bother you, or anything that he is doing, talk to him about it. Other than that, you go do you and live your life. Who knows, if you had learned something about yourself or that interests you, share your experiences with him. Most importantly; focus on yourself, enjoy life, and do things that you love. Life is about making mistakes but also learning from them but you are growing as well.