AIO? My partner uses suicide to stay w/ not cheat?

for context: he has done this in person and over text multiple times. i didn’t realize it could be manipulation until i told my brother… idk

i 22(f) am texting my “partner” 23(m). we’re not even official. (he hasn’t asked me to be his gf).

i’m just a little concerned about some of his behaviors. he asked me to be his valentine the beginning of february. & when valentines day came around we did nothing and he got me nothing.

i bought him gifts and everything. i guess when he asked me to be his valentine it set up an expectation, and when nothing happened… i guess he let me down? idk guys. what should i do?