He's not chasing after you, so you didn't inspire his passion or interest. And you won't, because these things happen for a guy the minute they first SEE the girl.
If he's not chasing after you, he's not interested.
If he is dating you but blows hot and cold, then he's not afraid to lose you to some other guy, so you don't mean much.
If he has been dating you steadily for at least 6 months, he is STARTING to LIKE you.
If he asks you to marry him, then he LOVES you. Note that asking you to move in does not necessarily mean he loves you. And that falling "in love" with you before at least a year of dating means he is in love with being "in love" but NOT with YOU.
You need to know that while the infatuation phase is indeed very exciting and heady .. it is just a phase. And that the stronger it is, the worse the relationship will be once that phase has died out ... and if the only thing the person liked WAS the infatuation excitement (mistaking it as "love"), then when that dies out so does their interest.
We NEVER end up happier long-term with someone, than we were happy before we had someone in our life. And the more we reach for love to "fix" us and our life, the more unhappy we will become once the infatuation has died out.
So please stop being so desperate for someone to "fix" your life for you. That is not how it works.