Jabb, Right of what? That Pete prevents Ritchie from going to bed?
That Dan had nothing to do with his birthday? That Ritchie came to fuck at least one other girl than Laurie? We know that Pete forbade him to touch Lexy and Ana; there was still Bree and Mel. He quickly realized that Bree was in iceberg mode (despite an attempt), Mel remains, I think she was the one he wanted to join in the room, and since he saw Drew chasing his ex GF, he may have said why not me, I say that to try to understand, not to excuse.
At L & P it became a "Spanish inn", the crossroads of ancient Glories, the refuge of the losers.
Very sad!