Love can mean different things to men at different points in their life.
When a man stands up for you during a difficult situation, attends functions that are important to you, considers you first when planning, goes with you to see your family or does little jobs/chores for you, these are all ways that a man says he loves you.
Dating sims, or relationship simulation role-playing games (RS-RPG), are a video game subgenre of simulation games, usually Japanese, with romantic elements.
There are all sorts of conventional images of men showing love through giving gifts: roses, chocolates, stuffed animals, cards, etc but these are not necessarily signs of that is an excellent gauge of his love for you: his time.
When a man spends more time with you and less with his family and friends, this is a very clear sign that he loves you.
I’m not saying it means I have to marry her, but it means that she has a special place in my heart and I will always do my best to be there for her regardless of how the relationship turns out (within reason).