One of the things I've really loved about this storyline is the way that nobody is black and white in their actions. Just about everyone involved has either made mistakes or behaved in a pretty disgusting way, but they tend to have had good intentions behind them or to have done some good deeds along the way too. It's making it very difficult to take sides tonight, since I love both Megan and Debbie and I think it's hard to say either of them can take the high ground here.
I think family loyalty plays a huge part in this story. We've seen it over the last week with Debbie lying for Charity, and it's been a very long running thread with Megan wanting to help Declan. In both cases I think it's understandable why they would act like this. Debbie was abandoned by Charity and Cain for so long, has had issues in the past with custody of Sarah (and with Sarah's health), and has a history of bad relationships. I don't think it's too far fetched to say that she would go very far to keep the family she has around her to make sure that she doesn't fall back into the problems of her past. Similarly Megan seems to have had a bit of an unstable upbringing (although not to the extent of Debbie's), there is unknown history surrounding her giving up her son, and suffering abuse at the hands of her brother. She showed unwavering loyalty to Declan at his lowest point, and I think that without her small family she would crumble. She doesn't seem to have had a great romantic history, and Declan seems to have been the only 'constant' in her life for a long time so I fully understand why she doesn't want to lose him.
In light of this, I think both have been driven to the point where they're going to do unreasonable things to protect what they have to. I think that few can say that Debbie is doing the right thing in pretending she had an abortion, but Chas and Charity and both guilty of guilt tripping her into it. Megan wasn't doing a great thing by confronting Debbie in the pub, but she has her heart in the right place and for all she knew Debbie would push the blame straight back on to Charity. I don't think there was any spite involved or any intent to ruin Debbie's relationship. Really, if she'd asked Debbie in private she would just keep up the act so it would defeat the point. Yes she could probably have found a better opportunity than in the pub, but remember that this is a woman driven to desperation after months of estrangement from her family.
Debbie and Megan have both been the victims of manipulation by Charity. Even Declan (IMO) told Megan about the 'Debbie's abortion' story because he knew she'd confront her about it. He's let her be arrested all as part of his revenge, so he's not exactly innocent himself. The same goes for Chas who's for some reason decided to bow to Charity and become her minion too.
While I'm here, I might as well say that I don't buy the "Charity really loves Declan" stuff for one minute, no matter how true it is. She manipulated him at a very low point, encouraging him to lie to his sister about the fire and to pin the blame on someone else for her own reasons. She's lied to him about having an abortion, manipulated him into cutting his only family off and used him purely for money back in January/Feb/whenever. That isn't the acts of anyone who loves Declan. IMO that is emotional abuse. Abortion isn't some little game she can play. She messed with emotions. Declan grieving for a child, Megan having to deal with the guilt of thinking she was responsible. She is an absolutely disgusting woman IMO. When she was getting her petty revenge on Jai it was fun to watch, but the more I think about it the more I see that there's nothing likable about her left. But as I said earlier, it's not all black and white and I can see why others still do like her.
So all in all, I'll say this. Personally I don't think Debbie should have lied for Charity. Not at all. If it was me, I would have cut Charity off a long time ago - I understand that it varies from person to person though, and that's fine. Similarly, I don't think that Megan had any malicious intent. She was driven to desperation and, though I wish she hadn't confronted Debbie in that way, I understand her reasons for it. I think both Megan and Debbie are just unfortunate victims of Charity's games. Nobody needs to pay, they just both need a hug from someone right now.
I bloody hate Charity.