I need advice please

I met this boy 4 weeks ago and 3 days later he asked me to be his girlfriend and for some stupid reason i said yes. So we’re still getting to know each other, while we are in a relationship. And its quite hard because we’re just learning to understand each other. Like, he gets jealous easily and his feelings get hurt easily. So i had to change the way i act to make sure i dont annoy him. Also, I don’t feel very comfortable around him to be honest. Like, yes i like him and im happy we’re getting close. But I haven’t known him long enough to fully trust him and feel comfortable around him. Like when we talk on facetime the conversation doesn’t really flow because we barely know each other. We never speak on the phone because it just gets awkward.

I said to him i think we should be friends for a while and get to know eachother before we get into a relationship cos i want it to feel real. But he said if i like him then theres no need for us to be friends. And 4 days into the relationship he told me he loves me. He literally wrote me some long paragraph. I didn’t know what to say, i just felt like he was being fake. Theres a part of me that feels like he’s just using me or something. Because he’s just moving SO fast. Like he want to do sexual stuff with me already when we hav only known each other for 4 weeks. Guys i need advice. I feel like i should break up with him, but i wanna be friends and at least get close before we get together. I mean, i knew my ex for a whole year before we got together. I just dont feel right in this relationship. Im gonna post the message he sent me. I really dont know what to do but i know this relationship is rushed and not right maybe i should end it what do you guys think? Lol i know my reply was kinda blunt but I seriously did not know what to sayyyy

I just feel like he is acting really childish helpp