Texting "I love you" to your partner can show how much you love him. Other cute messages that are less direct could be "You bring out the best in me," or "I'm having one of those days that make me realize how lost I'd be without you... Just wanted to let you know." Short messages such as "Thinking of you" can let your partner know that you care.
Quoting poetry is another way to express love via text. Use a quote such as "Love is not love that alters when it alteration finds" from Shakespeare, or "My night has become a sunny dawn because of you" by Ibn Abbad, to add a touch of romance.
Cute messages such as "I'm baking a sweet apple pie for my sweetie!" or "I thought about you and it made me smile" are simple and sweet. Sending messages that remind your partner that you are thinking of him or that you are doing something for him can be very cute.
Show your love with messages that get straight to the point, including "FYI: I love my man" or "Hey you. I love your face." These light-hearted messages keep your partner feeling loved and appreciated, without being too serious.