Ali, calm down and breath! in - out,slow and steady. Wait and see, no assuming, no jumping to conclusions. I understand how hard this is for you, maybe last night was too much too soon and he has realised this, it does not mean anything other than that, a slowing down slightly after the first high of passion. Maybe he felt the ghost of Helen too and now feels abit of a cad, off with the old on with the new, cept you were the old and are now the new.
Maybe let him set the pace and give him time to work things through, you may need to just be the friend you have been to him for a while longer yet.
Slow and steady wins the race. You have a lifetime of passion ahead. We all know the foundations are the most important part of any structure, don't skimp on that bit. God luck and take it steady. Did you ever use your last coaching session?