At this point Ml is just the authors ex (poor man if they are still together) they wished  they could put through the wringer for something. 

Lobelia is the worse addition. An artificial plot stretcher.

Mc is just as dumb and dense as him.

So we cool with false accusations here? No wonder the lunacy that is Tate got so popular

Is this self insert bait or something? 

If the ml was was the mc and laid out the facts he would be demolished for not taking her word for it.

We just gonna ignore she's just as bad at communicating as him? If not worse with how she's tarnishing his rep(the flower thing not going out alone thats on him)? And we're supposed to cheer on the obvious groveling scene later where she'll get the 'nothing AT ALL is your fault' speech later?

Is this how strong mc-bias is? Is this just projection of frustrations from past partners? 

He's dense but she's jumping to conclusions [a**-u-me reference here] and hurting her own feelings more than his actions ever could.