A "lingering feeling" refers to an emotion or sensation that stays with you for a longer period of time, even after the initial event or cause has passed. It is a lasting impression that remains in your mind or heart. Full definition
When a relationship ends even though you long for it to continue, lingering feelings of loss and sadness (among others) commonly surface. (datingadvice.com)
You might also be making your date jealous or uncomfortable, because it may sound like you have lingering feelings for past partners. (dateperfect.com)
If their upbringing has been religious, even if they cease to believe in this «God,» they may have difficulty freeing themselves from lingering feelings of shame and guilt. (religion-online.org)