Hey! Does anyone have a theory as to why OP's boyfriend is doing this?
Yes. It is as clear as mud.
'The Unified Theory of Cake' Chumplady.com
Cake eating is the preferred Nirvanic state of the unrepentant cheater. It’s the situation in which the cheater has the affair partner (AP) and the spouse. (“Having your cake and eating it too.”) In fact, cake is a preferred lifestyle for many.
Ideally, the spouse is unaware of the AP, because that means the cheater has unfettered access to cake. After discovery, however, many cheaters will go to tremendous lengths to maintain cake. Cake eating is confusing to chumps. Chumps tend to think of affairs as competitions – it’s me or him! Or what does she have that I don’t have? Chumps see marriage through their own lens, of monogamy and commitment to one person. If they are not committed to me, a chump thinks, then they’re for the AP. So who’s it gonna be?
Cake eaters do nothing to dissuade a distraught chump from this line of thinking. They would prefer a competition in which they are the center of the drama — all attention is on them! And a catfight ensues over their fabulousness. Cheaters would prefer you not discover their cheating, but if it must be revealed, this is how they’d like to see it play out. You try harder to win them back and maybe if you’re lucky, they’ll choose you! (See “The Humiliating Dance of ‘Pick Me’!”)
The goal of cake is not to choose. Chumps often go painful round after painful round as the cheater “commits” to the marriage and then retreats. Swears to be faithful to the spouse, and then is caught again with the AP. Makes promises to both the chump (and the AP), and breaks them. The cheater is NOT trying to decide between two people – the cheater is trying to maintain cake. Cake eaters are NOT confused. They are deliberately trying to maintain an unfair situation at your expense.
Cake eaters act vague. They need time. They appeal to you for patience. They feel very, very sorry for themselves. They’ll assert that they’re trying very hard to appease you (they’re not, but they may throw you a bone like marriage counseling, or sex, or paying attention to their children), but you’re soooo unreasonable with your demands. Cake eaters are defensive when you question their commitment or the sincerity of their remorse. They really just want you to leave them alone and let them get back to the business of eating cake.
There is only one way to deal with a cake eater and that is to take away the fork and leave.