Engaged - that's the conclusion about me and a girl (8)
I believe the answer is:
enmeshed
'engaged' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'the conclusion about me and a girl' is the wordplay.
'conclusion' suggests the final letters.
'about' is an insertion indicator.
'and' becomes 'n' (common abbreviation for 'and').
'a girl' becomes 'shed' (I can't justify this - if you can you should give a lot more credence to this answer).
The last letter of 'the' is 'e'.
'n'+'shed'='nshed'
'me' going into 'nshed' is 'nmeshed'.
'e'+'nmeshed'='ENMESHED'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for enmeshed that I've seen before include "Tangled up, snarled in" , "All tangled up as in net" , "Caught (in problem or snare)" , "Trapped" , "Caught in as in net" .)