Capricorn Man/ Aries Girl CONFUSION!

I known this Cap for over 2 decades/ 21 years. We only been talking on and off for 4 years (you know how caps are indecisive and go dissappears alot)..So finally he says he wants to make us a couple and we started a relationship 10 days ago. One day we was talking about sex and I told him, that I rather wait and he said it was fine. The next day he tells me that he dont understand why Im making him wait and that we should have sex. I told him i would like to get to know him better first since we been on and off, I feel like there is alot more to learn about each other. His response is that I need to trust him more and we know enough about one another...and If he cant have all of me since we are in a relationship then he rather us break up until Im comfortable. I even said why dont he just go stroke his peepee until im ready, which he decline (I didnt really mean for him to actually do that but I just felt like I needed another option here. I really want to be with him but he is making this hard for me. I even ask him a simple question the other day about "Why did he and his Ex broke up" and his response was its not important...however he did tell me about other ex that he cheated on because they were having relationship problems and sex was not as good anymore. I told him Im not into multiple partners or cheating and his response was "As long as u are on your A game then Ill be on my A game and u have nothing to worry about because I only want to have sex with you." I really care about this capricorn and I feel I finally got the guy I liked for 20+ years. I dont know what to do as far as should I just go with the flow A) Have sex with him B) leave him...

You're not kids anymore. Plus he admits to being a cheater. I suspect he cheats when he's not getting his way rather than working out the kinks to create a reciprocal relationship where your both mutually getting your needs met. Doesn't seem interested in getting to know you but then again you've known him for years so you have to explore your hesitation to go further with him.

"As long as u are on your A game then Ill be on my A game and u have nothing to worry about because I only want to have sex with you."

thats a bit heartless of an offer woudnt you say? maybe even a scare tactic, idk your relationship, but my 2 cents and intuition would not trust this person with my heart.