How do I show interest in my house mate without saying it directly

Life in a house share and I really fancy a guy. I don’t know how to approach this, I don’t know how to flirt or anything, but we really get on well.

I feel a bit sad because I always like guys but guys never show interest in me. I’m friendly, chatty, good sense of humour and look after appearance so it worries me

Also my house mates sleep with each other sometimes so it’s not weird