What do you say to someone when they say solo quiero que sepas que eres muy hermosa y secy y marvillosa y que significan mucho para mi?

Answer 1

There are typos/ungrammatical bits, but it means:

'I only want you to know that you are very beautiful and ('secy' - probably 'sexy') and wonderful and that you ('significan' is in plural) mean a lot to me'.

What you might say in reply, depends on you and your reaction, but might include:

'Gracias, usted es/eres muy amable' (formal/informal): 'Thank you, you are very kind'.

(Continuation of the former)

'....Pero 'no!'' = '....But 'No!''

'Y...?' : 'And....?'

'No se que decir' (accents on the 'e's): 'I don't know what to say.'

The possibilities are endless!