Ya know, whenever you do something to try to avoid stepping on your SO's buttons, you will inevitably step on other buttons. I do it with mine and vise verse, and the usual excuse to me is "I didn't want to upset you" with the unspoken follow up of "so I did something else that will upset you twice as much". Of course, we've been button stomping each other for 15 years now.
That's the thing about buttons -- everyone has 'em and someone who gets close to you is GOING to step on them.
sitnspin had a great synopsis of the strip -- the thing is not about Marten and the other girl, but about Marten concealing something (as he admits). It only get worse when he tries to justify the concealment with "I was protecting you!". And, looking back at the actual strip where he was asked out, it wasn't a case of "not important/forgot" since he remarks on it to Tai. Plus, Marten has complained enough over time about his lack of action with the girls, so it wasn't an insignificant moment for him.
That said, yeah, Dora is having herself a full out insecurity tango here, which, if she wasn't in the middle of it she would see and stop dancing. Jeph's doing an EXCELLENT job of keeping this pretty real.
Also, one other thing that keeps coming up here -- that Dora "stole" Marten from Faye. I did a little retrospective reading last night. Faye did everything she could to push Marten and Dora together short of rent them a room and hand them the key. Now yes, she did this out of her own conflicts, but the "stealing" thing was pretty much in Dora's head because she actually puts her friends before herself (in the way of really insecure people). You cannot steal a person out of a relationship who wants to stay in the relationship, and in reality Marten and Faye didn't even have more than a platonic relationship, so there was no 'stealing'. There was just a lot of insecurities dancing around.
http://www.questionablecontent.net/view.php?comic=120On a slightly more meta-note, Wow! Jeph! Way to build the dynamics! A story without conflict is boring. For conflict to be interesting, it has to take place between characters about whom the reader cares, and it has to have something worthwhile at stake. Otherwise it won't work. That some people around here are uncomfortable with what's going on is sad for them, but a good indication of how well Jeph has written the story. Very cool!