Being hit on, even mildly, is a positive thing in many ways (and negative in others). At my age I still get hit on because apparently I look pretty good for a 57 year old woman. But I also made a firm mental commitment to no relationships whatsoever until after I am "right" down there with myself, meaning done and healed from GCS and I will likely be 58 or even 59 before that is complete.
Having already made that commitment to myself, it makes it easier for me to say no. It's now very easy for me to let a guy down gently - "Look, I'm really flattered at your attention and you seem like a really sweet guy, but I'm going through a lot right now and I just need my own space." Saying something like that has been sufficient every time (so far) to gently push them back and create some space. If I need to be firmer, I will but so far I haven't had to do so.