The second dream about the desert and the spider: (resource: dreammoods.com)
Deserts are also symbolic of barrenness, loneliness and feelings of isolation and hopelessness. The desert landscape may also be a metaphor for feeling deserted and left behind.
To see a spider in your dream indicates that you are feeling like an outsider in some situation. Or perhaps you want to keep your distance and stay away from an alluring and tempting situation. A spider coming down on you or chasing you can be interpreted as feeling that you may be trapped or unable to escape a difficult situation. When you put these aspects together it sounds as though you may be feeling that you have been in a lonely relationship with little support and that you recognize you need to establish boundaries. Without these, you may feel that you have very few answers in finding safety or solace.
The last part of your question suggests to me that you are seeking a relationship with a male that is supportive and strong that helps you to find your worth. A trampoline is something that can symbolize ups and downs in life. It can suggest that you are resilient and with patience, you can bounce back with strength from difficult and emotional situations. It sounds like that if you remain strong, you are able to redirect your hope toward the relationship that you most want.
I hope that this has been helpful and if you feel satisfied with the answers, you will provide a positive rating, 3 stars or better, in order for credit to be received. Of course, even after a positive rating, communication can continue and further processing is available.
Best wishes, Jules!