Can somebody tell me if yoshiki actually likes tsukasa or is he just a fucking bastard

Both.
He mated with all of Tsukasa's girlfriends and then threw them away. He's a piece of trash.

Thanks for telling i was getting really confused about what the fuck he was doing

He didn't want the girls, he wanted them to broke up with Tsukasa in order to keep Tsukasa for himself.
And he bonded with them to keep them silent and not returning back to Tsukasa (〜￣△￣)〜

I though that was insinuated in my reply （/TДT)/