
The seme is young, hot, smart and sociable. Of course he has a lot of exes and hook ups. If I were him, I would too! Of course it will be hard on the insecure uke. But that is something the uke needs to work out on his own. The seme can reassure him all day, but until the uke learns to not only trust the seme but accept the fact that he IS good enough for the seme, no amount of reassurance from the seme will matter. It can and probably will cause a lot of problems in their relationship.

Honestly, I don't understand why people are acting so surprised or outraged at the seme telling the uke they are just fuck buddies. The author made it very clear in chapter 3 that the seme is a player. His grandfather called him into his office and tore him a new one for all the scandals his affairs were causing. Did anyone really think his attitude was going to magically change after knowing the uke for a few weeks!?
Ha ha, the seme can be dumb sometimes. The uke dated tall people because they reminded him of the seme. Not because tall people is his type.