This relationship is all due to your fear of loss. You're actually still scared of loss, so you have fallen in love with somebody you can't have.
It's called passive commitmentphobia.
Anyway, you're now completely infatuated with him and I know how bad this feels because I have been there! He consumes your every thought, you've forgotten your own opinions and likes/dislikes, you see everything through a lens of Him, everything to do with him seems exciting, glamorous and mysterious...
God, it's a fucker.
The only cure is going cold turkey. The good news is, it'll only take about 3-4 weeks of complete cold turkey for you to emerge from this awful, dark and lonely, one-sided obsession.
The bad news is, it's going to take every ounce of strength you possess to go cold turkey on him! I know how much you want to hope and believe that it could all work out.
Please don't send him an explanation text - you're not trying to end it, you're just trying to make him change his behaviour.
He KNOWS what he should be doing.
He KNOWS that couples see each other at weekends.
He KNOWS you want more than you're getting.
He just can't be arsed to give you what you want because he doesn't want it.
The very very best thing you can do right now is (sickeningly) the hardest: block all forms of contacting him, delete all his messages, book-wash or chuck out anything that has his scent on (clothes, etc) and sweat it out of your system.
Things that help:
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anti-depressants adjust the chemicals in your brain that cause the feeling of obsession and heartbreak, so you'll naturally fall out of love with him.
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New experiences, learning new things, or just bringing novelty into your world will give you a much-needed dopamine shot.
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Time.