No one can ever really know what's in another person's heart or brain, and everyone, single or married, is at risk of being devastated by love. It can happen to anyone at any time. If you can remove the self-blame, then you can start to be curious about what's developing between the two of you rather than be worried about it.
At the age of 50, after two years of being single, I decided it was time to overcome my trepidation about putting myself so "out there" and try online dating. After a few days working out which sites are best for our age group, I was soon 'winking' at and connecting with (and dismissing) so many men, I could barely keep track of what I'd told to whom.