I asked a lady out to lunch and she had to cancel, but has not come back to me with an alternate time/date. Is she trying to suss me out, see what I'm like as a person or wants me to ask her out again?

Another lady I'm interested in has a boyfriend. Whenever I'm in earshot, she mentions him to whoever she is talking to and raises her voice to make sure I hear (?). Yesterday she was going on about his birthday this weekend. She's gone from not mentioning it, to almost every breath!

I'm single (not had a proper girlfriend as yet) and think she can guess that. Why am I letting both of these things affect me? Just being around either of them makes me feel anxious and shy about talking to them.