To tell the truth if I opened up to someone I liked about exes and stuff (good or bad stories) and got a cold bucket of water like that I'd be a bit disappointed as well, u said that a couple of weeks have passed, u only had sex 2x over the 5 months u guys know each other, if he really ended up liking you for real, he might be a bit on the insecure side, thinking that u're doing it on a whim, and he might end up getting hurt, besides, such things u dont say over a text! U say face to face, with the right mood, pretend to be shy if u have to or something to make up for the delayed answer, dunno.