key logger and sniffer PROTECTION

Hello. I’m a young girl (22 just recently) and I, like many youths my age, am EXTREMELY paraniod. I currently use a laptop and access the internet through my boyfriends wireless connection that is in the room next door. We have LAN set up, but it isnt usually on. My boyfriend and I have trust issues and I have caught key loggers and this sort of thing in the past. My quesiton is, what can I do to protect myself from anyone seeing what i?m doing, who i?m chatting with, ect? I need my privacy protected. Any suggestions? Thanks in advance 🙂