All feelings are real, it's just whether you can interpret and understand your feelings correctly, or if your feelings are reciprocated that is at issue.
I still sometimes crave contact with ex girlfriends, or wonder what it would be like with them.
I don't go there, as I am married, and have been with my wife for 9 years, so in my case these feelings are not love, but a combination of regret, reminiscence, lust, and grief at the lost relationships.
Going back there is never a good idea, as you will stir up feelings in yourself, and in the ex, that will be hard to deal with, and likely lead to more pain for both parties.
I think it's not so much a case of whether your feelings are real, so much as trying to understand and interpret them, and see if they are what you think they are on the surface, or if it's thoughts, feelings and emotions playing a trick on you, and your thoughts are confusing lust, desire, or affection for love.
It's never a good idea to initiate something deeper than friendship, or even sometimes friendship, if it's with someone that can't reciprocate, especially if they already have a partner, or have just come out of a relationship.
One technique you could use would be to keep a thoughts and emotions diary, you can write this each day, and at the end of the week read through it, as it will help you to better understand the complex divide between what goes on in your head and what's happening in your heart.
The fact you have thought about this, and want to work it out, already means you're on the way.
Aspie hugs.
Ben.