I don't know what to do, I feel horrible and guilty and overall just unhappy.

I've been seeing this guy for about a month now and when we first started I told him how much I didn't want a relationship cause I recently ended a really toxic 2 year relationship with my ex and I just wanted to have some fun. now it's been a month and he already told me he loves me but I can just feel he's starting to control me (because I'm so submissive), he also seems to start a lot of arguments and be mad at me when I don't really do anything wrong. Im honestly just the most unhappy I've been since I broke up with my ex. I don't want to hurt his feelings but I also don't want to lead him on anymore or just be with him anymore. this is literally keeping me up at night. I've never broken up with anyone before and this guy is just soooooo into me I feel like I'm really gonna hurt him :(