Advice

So I like this guy and we work the carnival together, well this year we talked more and hung out more than the previous years and we had a great time this past weekend working together and watching the fireworks. Well so far we've just talked about work and stuff but I'm afraid he's going to lose interest or I'm going to be accused of being annoying or clingy. Ive sent a few messages with no response. Being inexperienced in relationships and having social anxiety, what should I do?