In a non-romance reading, this could mean feeling the need for rest and wanting a nice long siesta. The person in question needs "recovery" time, perhaps after stress or illness. The person can feel at peace β calm and serene. The 4 of Swords can depict someone who feels isolated, withdrawn, ignored, alone... that kind of stuff.
As for romance, it's probably one of the worst cards to get. In terms of feelings, there's not much going on β they're dead, still, inactive. Their feelings are stoic, detached, apathetic, stolid, unconcerned... etc. πΏπ