I kissed someone too soon on my ex, what do i do?

[sinead]

me and my ex went out for 2 years. We broke up on good terms but the break up was so hard for me. we were both at a party the other night 2 weeks after the break up. it was my first time seeing him since the break up and this made me really sad and i ended up getting very drunk. i then kissed another boy at the party, ive no idea why i did it, i have a slight feeling it was a terrible attempt to get over the ex but i cant remember. i regret it so so much. my ex didnt see it happen but heard and now hates me, which is understandable. i wrote a huge apology to him and then he ended up deleting me on facebook. i know im an absolute bitch for what i did and all i want to do is get us back on okay terms.