I love spending time with you
When you say you love your partner, and they say 'I love spending time with you' like it's a punishment, and they're already counting down the minutes until you leave.
'I love you!' 'I love spending time with you.' (He said that while I was leaving.)
'I love you!' 'I love spending time with you.' (She said that after I told her I had to work.)
'I love you!' 'I love spending time with you.' (He said that while I was texting someone else.)