How to apologize and make things right if it is not to late?

I fuck up big time and yes it all my fault !!! I was dating a guy for 4 months but we had a little disagreement and he stop seeing me but would call and text, this started when I saw a woman on his phone never question him about but was hurt by it. I drove by his house and saw her car there at his house, got upset and text her in a second line about it. Dumb I know he called that number and I answered it !!! Then he blocked me on Facebook but not his phone! Is it too late to apologize and make things right !!! I know I was a in the wrong and will acknowledge that. How do I make things better I feel really bad and heartbroken over it

How to apologize and make things right if it is not to late?
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