What are some quotes for : I dont know what you say about me but I hope your honest?

So I have a boyfriend , we have been going out for a month now , and he says he cares about me and he really likes me, I really like him too, but people have told me hes a flirt but I know he really does like me and I want to tell him something where he sees im being serious about our relationship and I dont want him to play me also hes going on a trip so also anything that says im going to miss you and I hope you think about me ? Please Help. Thank you.