It means that you care a lot of your friend and the friendship matters a lot. However, this does not mean that your friend doesn't value the friendship but will be judged by how he/she reacts after receiving the text. Some people are busy and sometimes need to be talked to, inorder to distract them from what they are doing for the sake of the friendship.
If you're texting a boy for your friend that means she has no confidence and guys dont like that. A lot of guys don't like for the girls friends to be in the middle it can show immaturity. If you give a guy your number and he gives you his then wait to see how long it takes him to make the first move. After a couple of days that may mean he's nervous and you need to make the first move or nothing can come out of it. If he doesn't like you then at least you can say you tried and you wont have the thought of "what if"