Well if you want a relationship, go for a relationship. If you want casual sex, go for casual sex. As long as you are honest and upfront about it, they couldn't be mad at you for being deceitful.
At least you are getting some! I've barely thought of another girl as beautiful in comparison to my ex, and even had some girls interested in me but I haven't made a move. And it's been three months since the break up, almost two since we stopped talking. And my ex has been dating a guy since before we stopped talking. Don't be like me, please.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.