If his friends are friendly with you and treat you as one of the crew, it is quite clear that you are important.
In movies they teach us that it's the smartest just to tell someone that you love them, so there is a large number of women who won't believe they are loved until they hear those two little words.
Some men simply don't want to say it because it makes too much pressure, but that doesn't mean they are insensitive. And they do show love, and these are just some of the ways.
Long, passionate kisses
The way that he kisses you says much more than what he says before or after the kiss. If he is kissing you passionately, you don't need words to know how he feels.
They can pretend to like you for his sake, but you will immediately notice that. If his friends are friendly to you and treat you as one of them, it is quite clear that you are important.
Behavior after the kiss
If he backs off instantly, that means that something is wrong, but if your partner is smiling after the kiss and looking you straight in the eye, it means that he really cares.
Some men will interpret kisses as a prelude to sex, and if the whole story doesn't end with sex, they will be clearly disappointed. A partner who is happy just because he kissed you, is showing that he loves you.
He listens to you
And not just when you are talking about things that are interesting to him, but always. The man who wants to hear about your day, the one who remembers little things you mention - that's the guy who's showing you love.