Restarting a Love Life

After 20 years of being single( i am 48) I have started seeing this lovely man. We have been seeing each other for over 6 months now and it looks like it could be a good relationship. Unfortunately I have been suffering from fear and insecurity big time.
He is still married but has been separated for 3 years. He keeps in touch with his wife. I realise it is me who needs to grow but at times get very desperate.
I try some meditation and inner child therapy. Also will start working out more.
If you have any suggestions, it would be very much appreciated.