How do you....

How should I go about telling My boyfriend he has my heart but I dont want him to hurt me....

Tell him just that :)

But i dont want him to think that im ready to settle down i mean we did just start dating on monday...

Telling him that shouldn't make him think that way. let him know how you feel about him... and tell him just that.
"you have my heart, don't break it" and let him know " this doesn't mean that i'm ready to settle"

be honest with him. let him know how you feel.

Ok I think I will try that..Thanks..