If you get right down to the gritties, we are all subject to the "pain v.s. pleasure" syndrome. We try our best to avoid pain. We do other things because they bring us pleasure. Giving of ourselves, i.e., giving love, feels good. It feels especially good when that love comes back to us - in whatever form it may take. Therefore, I submit that there is no such thing as totally unselfish love. It feels good, therefore, we do (give) it. Don't waste a lot of time feeling guilty about it. This is the way thing are.

It feels good to extend your friendship; your love. Just do it.