Help please!

Dating this guy for about three months. His flirting with me has decreased drastically. No more flirting. No more sexting. When i asked if we could be more romantic and talk like that a little more affectionate throughout the week, he said that’d be difficult but he could try. He said that his feelings are the same as they have been and nothing new has happened so he feels like it’s repetitive. I personally feel like when i really like someone, there’s always ways to be expressive of that. Not 24/7 but just a little times throughout the week. I’m getting super frustrated and it’s really affecting my mind. I feel like if a man wants to be with you, he will always show his affection towards you and it wouldn’t be like pulling teeth. I just don’t know what to do. I keep feeling like if i break up with him, he wouldn’t really care and that i’m replaceable. I really like him but this is making me lose my mind. Please help.