PLease help older advice? please?

First off I’m 24; I have a kid from a previous relationship. I have been severely depressed for the last year over my last relationship, I was with my EX since high school (10th grade) w/ him everyday lived together, the kid-everything... anyways i thought the gr was greener and i lied to him and broke up with him... There is no going back on that relationship b/c of all the pain i put him through. I think that is why i am so sad because i know i lost the best thing i ever had. Anyways. This guy i met is really nice, but downfall is he is 40 years old... now, that is way too much for me... but i feel bad b/c he is an amazing guy, has 3 three kids, owns his own company, smart... needless to say he is settled. He wants to be with me in the worst way. He had a bad break w his ex, he walked in on his wife with the neighbor. He is always texing me things like you’re beautiful, i think your a great person... great conversation... etc... Now sometimes its a little much, b/c he’ll ask if i want to see him and if i dont reply instantly its like “i take it u dont want to see me” “don’t I make you happy” then I get odd ones “are u falling for me?” I only knew him for 2 weeks- he tells me he wants kids, he wants to get married again... etc... It's like he’s a girl, it makes me feel as if he’s self conscious// maybe my age??? But im scared, I’m not over my ex like i said I’m emotionally attached to him and i cant let him go, I don’t enjoy life like I should because of what happen with my ex and i dont know if I’m making a mistake b/c in my head i know nothing will work with my ex but i cant accept it and i dont know if there is a maybe.. And another LARGER problem is this age factor with the other guy... HELP PLESE, just guidance,.