Sometimes, for a variety of reasons, your research experience doesn't work out. Maybe you don't like the lab culture, the project, don't have enough time in the lab to gain the skills you need, or you're simply overextended and need to cut something.
If you won’t continue with undergraduate research next term, but your advisor believes you plan to, update them the next time you’re in lab. Yes, it will feel awkward but most advisors will be supportive of your decision.