Is it possible for a spark to develop later if some attraction is there?

Compatibility is a safe bet. The fact that you and him are compatible means you're better off being together than ending the relationship. The spark thing is usually the great chemistry thing between two people. Some get it some dont but it doesnt mean its over just because he doesnt get it. If he decided to end the relationship because of the lack of spark its his problem not yours.You can move on and just make sure you have high standards no matter what. Be selective and be happy.If someone makes you feel good because you're together and you've got compatibility together you're doing better than a lot of couples.

Maybe you should just give it some more time and just go with the flow and see how the things develop. Sometimes the "greatest" love doesn't happen immidiately and it takes time for the "spark" to "glow". So i guess the time will show, so just don't rush the things and let it happen....if it doesn't you will simply feel it.

It depends how long you've been dating. It IS possible for a spark to develop, but it's not a guarantee. I would say you usually know within 1-3 dates. If it's been longer than that, I think you may be better off as friends.