My theory is that she offloads all of her guilt on to me and she uses me to give her a alibi, when in fact she's meeting up with her lover! I'm friends with her foremost but I don't want to get caught up in her lies. Should I subtly end our friendship?

if you still want to be friends tell her you are no longer going to be her alibi, will not cover for her and you don't want to hear anything about her cheating or problems with her husband - however from what you have said she sounds quite selfish, so maybe ending subtly would be best. you don't want her to drag you down with her problems because from what you have said it seems like a one way friendship

Ask me anything