Some examples of acting lonely when you meet someone new you:
1. Want to become too serious as friends or romantic relationships too quickly. Generally latching on to anyone being nice.
2. Overshare personal information.
3. Complain about how people are jerks and don't appreciate you.
4. Complain about ex-partners or ex-friends.
5. Complain about lack of dates or friends.
6. Use too much self-deprecating humour, or generally talk about yourself
being alone and being lonely