1.He Believes You Aren't Interested in Him
Men, contrary to popular thought, experience insecurity as well. He might like you a lot, but he's too shy, introverted, or scared to say anything. If this is the case, consider whether you're coming across as being overly assertive or giving him the impression that you reject men on a regular basis. Perhaps you'd been answering the phone a lot or showed no interest in what he said, both of which will cause men to back down. Stop being so "hard to get!" if you're interested in him. No one wants to be rejected. Unless you tell him directly or subtly that you like him, he won’t make a move.
2.He’s Already Taken
It's possible that he won't ask you out because he's already in a relationship. He could be dating or, worse, married to someone else! It won't matter if you're practically throwing yourself at him if he's into another girl; he won't respond the way you desire. He won't want to give you the wrong impression or jeopardize his relationship with her. If you're the one who's taken, on the other hand, his not asking you out shows that he respects your relationship status.
3.You're Not Sexually Compatible
Sex on a first date might be a little unpredictable. Though the chat at dinner may have turned you on, their performance in bed may fall short of your expectations. You sent him a signal that you wanted to try sex, but he declined, claiming that he wasn't in the mood, that he was tired, or that he needed to shower first, so you just didn't do it. he may be incredibly sexual, but only for several minutes, and it didn’t satisfy you. Perhaps you prefer it rough, while he prefers delicate and tender. You're not "doing it wrong," you’re just not sexually compatible.
When someone doesn't ask you out again, it can be heartbreaking. You may blame yourself for that, but it isn't always your fault. Every scenario is different and we will meet someone special one day.