At least, he has admited that he's a coward that used his familial/work circumstance as excuse since they started their relationship.
It sting him to see that some words at the right time can change everything. It's a good medecine for him. Now, he'll act to salvage his mess.
Can't really blame the vampire boy who is trying to score point because, yeah, he felt some disturbance in the force . But yeah, he's shameless when he said "oh, we'll have a bit of fun. Nothing serious" while adding "I want you to know me better". Author want to use him as drama point to make the pair progress, but he built him as a snake who take advantage of this situation. Slimy guy

I can't see how he'll remain as their colleague after this. Dunno how author will manage this. Power of friendship I guess.
Last panel, the wrecking ball is back. Shit will hit fan soon