While getting the order and the elision right in the simple phrase je t'aime is complicated, modifying the phrase with 'always' is as simple as tagging the French word for 'always' onto the phrase je t'aime.
You'll probably need to know how to ask where the bathroom is: Où sont les toilettes? and know how to introduce yourself: Je m'appelle _______.
Whether you simply say je t'aime, or you use a longer phrase, you may just be surprised by how powerful the effect of the French language can be.
For example, to express that you are washing your own hair, you would say: Je me lave les cheveux, whereas to say 'I'm washing YOUR hair', you would say: Je te lave les cheveux.
'Always' in French is 'toujours', which means the straightforward way of saying "I love you always" in French is "je t'aime toujours."