That is why i am so grateful for the very little known iOS great feature that allows us to forward text messages so easily.
So, how you will able to do it. Here you go :
Step 1: First, you need to find the message conversation you want to forward.
Step 2: Now tap twice on your speech bubble of interest until a black bubble comes up that says "Copy and More..." (Remember: if you are not tapping on the message with an email, phone number, or a link inside it, make sure you do not tap directly on that).
Step 3: A bunch of circles will going to pop up on the left side of the screen, next to the speech bubbles. By default settings, your phone will add a check-mark to the circle next to the most recent text message. If you do like to forward more than one, tap the empty circles next to the messages.Then you can tap on the curved arrow at the lower right corner of your iPhone screen.
Step 4: You will be taken to a new screen with a new text message conversation. The recipient section will be black for now. Fill it in, now your text of interest is waiting to be send.
That is all, to save yourself from a lot of annoying copying and pasting from your phone again and again.