I believe what it means is that he ran into an old girlfriend and that she goes up to him and just starts crying and surprising him with a "magic trick" to try and get him back and he is shocked like a lightning strike (hence crying lightning). He admits that at first he likes this and he likes seeing her coming back wanting to go back with him, and he likes how in bad times or "rainy afternoons" she goes to him and tries to make him feel bad or "aggravating the ice cream man". He then says that as he himself was about t fall for the trick he tells himself to stop falling for it because he also sees that she knows he's falling for it, so he says o to her. So she, being so proud, gets mad because it always works for her and he then starts to hate that shes trying to trick him because they'res no "cracks to clasp or gaps to claw" or that she has no way of convincing him.
I believe what it means is that he ran into an old girlfriend and that she goes up to him and just starts crying and surprising him with a "magic trick" to try and get him back and he is shocked like a lightning strike (hence crying lightning). He admits that at first he likes this and he likes seeing her coming back wanting to go back with him, and he likes how in bad times or "rainy afternoons" she goes to him and tries to make him feel bad or "aggravating the ice cream man". He then says that as he himself was about t fall for the trick he tells himself to stop falling for it because he also sees that she knows he's falling for it, so he says o to her. So she, being so proud, gets mad because it always works for her and he then starts to hate that shes trying to trick him because they'res no "cracks to clasp or gaps to claw" or that she has no way of convincing him.
this is my interpretation