My ex still has my attention

Hello, well I've been dating my boyfriend for the past 3 months but I've known him for 2 years. Although now that we've been dating our conversations have been limited to just my asking him questions. I find that my 5 minute convos with my ex are more stimulating then my 2 hr talks with my boyfriend. Should I feel ashamed that I prefer talking to my ex than my boyfriend? How could I maintain a convo with my boyfriend without making it seem like an interrogation?