Indeed. They are first envisioning the future before committing to one. ENTPs hate choosing something because it means closing other options. Even if they want to commit to you, it's a big step for them to say so, because then other possible futures are closed. Also, they don't want to commit if they aren't absolutely sure that's what they want and that's the choice they are able to stick to, especially if they love you. They don't want YOU to get stuck with a flaky ENTP, YOU deserve better than MY puny love. Only when the choice is needed, they will choose and do so very quickly.
I've been in love with someone (the ESTJ who's now my husband) for almost a year, trying to give hints and make him say he wants to be together with me and failing horribly at it. We were together at university. We just got our grades, he was walking towards his car and then it struck me - I had to choose between three months of him not knowing about my love and maybe meeting other girls or just going to him and saying I fancied him, with the risk of knowing for sure he didn't like me. I had a history of falling in love with impossible guys - a gay one, someone much older than me,... As he was my age, surely he was gay or had a better girlfriend or...!
The decision was made in a fraction of a second. I ran towards the car and told him.
If you want a definitive answer, you've got to take a risk. You've got to make it clear that if he doesn't choose for you, THAT option (a future with you) has at least a risk to get closed soon!