I know He loves me, even if I don't feel it. Because I believe the Bible to be a reliable source.
I have also felt His love on a number of occasions. When I am deep in worship, I feel spiritually connected and can be overwhelmed with a sensation of love going back and forth.
Sometimes there are little things He does, ways He provides for me or answers my questions, it makes me feel that He cares about the desires of my heart.
The best way to feel His love is to spend time in prayer and worship and feel the very tangible connection.