My boyfriend started working part time since last month because he wanna have a break from full time job. I supported him and even been paying for him. However he booked solo travel trip one after another for himself and I’m not happy he’s spending money for himself while I supporting him in other aspect. How do I tell him I only wanted to support so he doesn’t worry abt daily expenses and not so that he can go travel.
Thank you for reaching out on this. I can see that you are a supportive partner and recognise his need for a break from a full time job. Hence you have agreed to support in the interim with the expectation that he will go back to full time work and resume fair contributions to the house hold expenses.
It will be good to speak openly with him on your expectations & the need for clearer, fairer and transparent financial arrangements. Let him know the strain you are feeling with him not contributing.
I recommend speaking honestly and openly on shared budgeting so that he fully understands the situation. 
This article may help you frame the conversation: Couple's guide to shared budgeting