Moving On Advice HELP !!

Miaa

okay so me and my ex still communicate but i feel like that’s really to an end idk it’s just weird. but literally a day or two ago i started texting someone and he seems nice but it’s like he just it moving so fast like he’s telling me he wants me to be his other half and he wants us to be together and he really likes me and thinks so highly of me but literally it’s only been a couple days and he wants to spend time with me and stuff like that... idk is that a red flag or is that how it’s supposed to be ? bc my ex that i was with for 3 yrs didn’t even treat me like that. i’m 17 he’s 19.